feat!: x/gov: raise max description length to 10k chars (#10740)

The 5k character limit for governance proposals is something I've ran into several times now. This feels like an artificial constraint. The deposit is our mechanism to combat spam, and extra state used for this is really not a problem.

In this PR I propose raising this limit to 10k characters, to remove much of the immediate need for working around this 5k limit.

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## Description

Closes: #XXXX

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---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [x] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
- [x] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [x] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

(cherry picked from commit ea2bcc8)

# Conflicts:
#	CHANGELOG.md

CHANGELOG.md

@@ -54,10 +54,28 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+<<<<<<< HEAD
 * [\#10486](https://github.com/cosmos/cosmos-sdk/pull/10486) store/cachekv's `Store.Write` conservatively
   looks up keys, but also uses the [map clearing idiom](https://bencher.orijtech.com/perfclinic/mapclearing/)
   to reduce the RAM usage, CPU time usage, and garbage collection pressure from clearing maps,
   instead of allocating new maps.
+=======
+* [\#10439](https://github.com/cosmos/cosmos-sdk/pull/10439) Check error for `RegisterQueryHandlerClient` in all modules `RegisterGRPCGatewayRoutes`.
+* [\#9780](https://github.com/cosmos/cosmos-sdk/pull/9780) Remove gogoproto `moretags` YAML annotations and add `sigs.k8s.io/yaml` for YAML marshalling.
+* (x/bank) [\#10134](https://github.com/cosmos/cosmos-sdk/pull/10134) Add `HasDenomMetadata` function to bank `Keeper` to check if a client coin denom metadata exists in state.
+* (types) [\#10076](https://github.com/cosmos/cosmos-sdk/pull/10076) Significantly speedup and lower allocations for `Coins.String()`.
+* (x/bank) [\#10022](https://github.com/cosmos/cosmos-sdk/pull/10022) `BankKeeper.SendCoins` now takes less execution time.
+* (deps) [\#9987](https://github.com/cosmos/cosmos-sdk/pull/9987) Bump Go version minimum requirement to `1.17`
+* (cli) [\#9856](https://github.com/cosmos/cosmos-sdk/pull/9856) Overwrite `--sequence` and `--account-number` flags with default flag values when used with `offline=false` in `sign-batch` command.
+* (rosetta) [\#10001](https://github.com/cosmos/cosmos-sdk/issues/10001) Add documentation for rosetta-cli dockerfile and rename folder for the rosetta-ci dockerfile
+* [\#9699](https://github.com/cosmos/cosmos-sdk/pull/9699) Add `:`, `.`, `-`, and `_` as allowed characters in the default denom regular expression.
+* (genesis) [\#9697](https://github.com/cosmos/cosmos-sdk/pull/9697) Ensure `InitGenesis` returns with non-empty validator set.
+* [\#10341](https://github.com/cosmos/cosmos-sdk/pull/10341) Move from `io/ioutil` to `io` and `os` packages.
+* [\#10468](https://github.com/cosmos/cosmos-sdk/pull/10468) Allow futureOps to queue additional operations in simulations
+* [\#10625](https://github.com/cosmos/cosmos-sdk/pull/10625) Add `--fee-payer` CLI flag
+* (cli) [\#10683](https://github.com/cosmos/cosmos-sdk/pull/10683) In CLI, allow 1 SIGN_MODE_DIRECT signer in transactions with multiple signers.
+* (x/gov) [\#10740](https://github.com/cosmos/cosmos-sdk/pull/10740) Increase maximum proposal description size from 5k characters to 10k characters.
+>>>>>>> ea2bcc8ad (feat!: x/gov: raise max description length to 10k chars (#10740))
 * (store) [\#10741](https://github.com/cosmos/cosmos-sdk/pull/10741) Significantly speedup iterator creation after delete heavy workloads. Significantly improves IBC migration times.
 * (module) [\#10711](https://github.com/cosmos/cosmos-sdk/pull/10711) Panic at startup if the app developer forgot to add modules in the `SetOrder{BeginBlocker, EndBlocker, InitGenesis, ExportGenesis}` functions. This means that all modules, even those who have empty implementations for those methods, need to be added to `SetOrder*`.
 * (types) [\#10076](https://github.com/cosmos/cosmos-sdk/pull/10076) Significantly speedup and lower allocations for `Coins.String()`.

x/gov/types/content.go

@@ -9,7 +9,7 @@ import (
 
 // Constants pertaining to a Content object
 const (
-	MaxDescriptionLength int = 5000
+	MaxDescriptionLength int = 10000
 	MaxTitleLength       int = 140
 )