chore: use new type for BlockchainId

[mattsse]

this replaces the BlockchainId type alias with a wrapper type, this makes it a bit nicer imo.
and also ensures that it no other u64 value can be used as an id to modify chains

[codecov]

Codecov Report

Merging #5012 (d05ac27) into main (34bc498) will increase coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is 90.00%.

Files	Coverage Δ
crates/blockchain-tree/src/block_indices.rs	84.45% <ø> (ø)
crates/blockchain-tree/src/blockchain_tree.rs	84.27% <100.00%> (+0.11%)	⬆️
crates/blockchain-tree/src/chain.rs	77.20% <ø> (ø)
crates/blockchain-tree/src/state.rs	83.60% <76.92%> (-2.40%)	⬇️

... and 7 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	15.85% <0.00%> (-0.01%)	⬇️
unit-tests	62.38% <90.00%> (+0.03%)	⬆️

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

Components	Coverage Δ
reth binary	30.93% <ø> (ø)
blockchain tree	80.82% <90.00%> (+0.01%)	⬆️
pipeline	88.37% <ø> (ø)
storage (db)	74.40% <ø> (ø)
trie	94.48% <ø> (ø)
txpool	48.60% <ø> (+0.45%)	⬆️
networking	76.45% <ø> (-0.02%)	⬇️
rpc	57.99% <ø> (+<0.01%)	⬆️
consensus	63.01% <ø> (ø)
revm	27.89% <ø> (ø)
payload builder	7.96% <ø> (ø)
primitives	86.24% <ø> (+<0.01%)	⬆️