feat: support skip attribute in RlpEncodable derive macro

[leruaa]

Closes #1102

[mattsse]

lgtm

[codecov-commenter]

Codecov Report

Merging #1116 (e84384b) into main (5c32ad0) will increase coverage by 0.07%.
The diff coverage is 80.76%.

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@@            Coverage Diff             @@
##             main    #1116      +/-   ##
==========================================
+ Coverage   74.63%   74.71%   +0.07%     
==========================================
  Files         323      326       +3     
  Lines       34956    35173     +217     
==========================================
+ Hits        26089    26279     +190     
- Misses       8867     8894      +27     

Flag	Coverage Δ
unit-tests	74.71% <80.76%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crates/common/rlp-derive/src/lib.rs	88.23% <ø> (ø)
crates/common/rlp-derive/src/utils.rs	71.42% <71.42%> (ø)
crates/common/rlp-derive/src/en.rs	96.80% <88.88%> (+0.10%)	⬆️
crates/common/rlp-derive/src/de.rs	93.58% <100.00%> (+0.16%)	⬆️
crates/primitives/src/peer.rs	47.36% <0.00%> (-15.79%)	⬇️
crates/net/network/src/swarm.rs	61.63% <0.00%> (-0.79%)	⬇️
crates/net/eth-wire/src/types/blocks.rs	94.18% <0.00%> (-0.73%)	⬇️
crates/net/network/src/manager.rs	47.44% <0.00%> (-0.57%)	⬇️
crates/stages/src/stages/bodies.rs	92.68% <0.00%> (-0.45%)	⬇️
crates/net/rpc/src/debug.rs	0.00% <0.00%> (ø)
... and 21 more

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[leruaa]

@mattsse I think This PR can't be merged yet, the skipped fields are still taken into account in RlpMaxEncodedLen

[onbjerg]

Converting to a draft, feel free to move out of draft when this is ready for review!

[leruaa]

It's ready to be reviewed 👍