feat: add block propagation handlers

[mattsse]

Adds missing block propagation handlers for NewBlock and NewBlogHashes.

While they're part of devp2 v67 they should be switched off for POS network: https://eips.ethereum.org/EIPS/eip-3675#devp2p

Since this is determined by the forkId we should add this as part of the is_valid_message,

[codecov]

Codecov Report

Merging #205 (00bf63c) into main (b60ced1) will decrease coverage by 0.32%.
The diff coverage is 21.95%.

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
- Coverage   68.69%   68.36%   -0.33%     
==========================================
  Files         213      213              
  Lines       17896    17974      +78     
==========================================
- Hits        12293    12288       -5     
- Misses       5603     5686      +83     

Impacted Files	Coverage Δ
crates/net/network/src/fetch.rs	0.00% <0.00%> (ø)
crates/net/network/src/import.rs	0.00% <0.00%> (ø)
crates/net/network/src/manager.rs	0.00% <0.00%> (ø)
crates/net/network/src/message.rs	0.00% <0.00%> (ø)
crates/net/network/src/state.rs	0.00% <0.00%> (ø)
crates/net/network/src/swarm.rs	0.00% <0.00%> (ø)
crates/net/eth-wire/src/types/broadcast.rs	66.66% <100.00%> (+28.57%)	⬆️
crates/transaction-pool/src/test_util/mock.rs	63.04% <0.00%> (-7.83%)	⬇️
crates/transaction-pool/src/pool/txpool.rs	59.14% <0.00%> (-0.54%)	⬇️
crates/net/discv4/src/lib.rs	68.00% <0.00%> (-0.15%)	⬇️
... and 1 more

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[Rjected]

looks good, although there is still no forkid for the merge yet afaik. for example geth drops block broadcasts when its merger.PoSFinalized() returns true. this is set by the handler for engine_forkchoiceUpdatedV1

[mattsse]

nice find, I will create an issue for this and think about a solution, where and how to configure this.