feat: add discv4 terminate

[mattsse]

Closes #4874

supersedes #4879

[codecov]

Codecov Report

Merging #4888 (00aec1a) into main (fbfca3f) will increase coverage by 0.03%.
Report is 3 commits behind head on main.
The diff coverage is 18.18%.

Files	Coverage Δ
crates/net/discv4/src/lib.rs	64.41% <18.18%> (-0.37%)	⬇️

... and 12 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	15.54% <9.09%> (+0.03%)	⬆️
unit-tests	62.58% <18.18%> (-0.01%)	⬇️

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

Components	Coverage Δ
reth binary	32.63% <ø> (+0.35%)	⬆️
blockchain tree	80.44% <ø> (ø)
pipeline	88.45% <ø> (ø)
storage (db)	73.32% <ø> (+0.02%)	⬆️
trie	94.48% <ø> (-0.04%)	⬇️
txpool	49.63% <ø> (+0.50%)	⬆️
networking	76.10% <18.18%> (-0.06%)	⬇️
rpc	57.72% <ø> (-0.06%)	⬇️
consensus	61.06% <ø> (ø)
revm	28.54% <ø> (ø)
payload builder	8.16% <ø> (ø)
primitives	85.24% <ø> (-0.02%)	⬇️