Performance experiments

[CathalMullan]

Will never be merged directly - just a way to check codspeed results.

EDIT: Codspeed doesn't seem to speed up at all using smallvec, but we see a decent improvement locally on the M1.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Coverage Δ
src/node/search.rs	79.20% <100.00%> (ø)
src/router.rs	86.28% <100.00%> (ø)

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #156 will not alter performance

_{Comparing performance-experiments (dce5481) with main (6753347)}

Summary

✅ 16 untouched benchmarks