chore(gov): Convert uint8[] to bytes for Message value bz (#1211)

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### Summary by CodeRabbit

- Refactor: Updated the `CosmosCodecAny` and `CosmosCoin` structs,
replacing `[]uint8` with `[]byte` for the `Value` field to align with
functional usage in Cosmos SDK.
- Refactor: Updated the ABI definition for the `GovernanceModule`
contract, replacing `uint8[]` with `bytes` in the `getProposal` and
`getProposals` functions.
- Refactor: Updated the `decodeProposalMessages` function to handle
different types using reflection.
- Chore: Updated the code generation tool version from v2.35.2 to
v2.35.3 across multiple files.
- Chore: Added build constraints for the `rlpgen` tool in
`transaction.rlpgen.go`.

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