Remove smallvec usage.

[codecov[bot]]

Codecov Report

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

Files with missing lines	Coverage Δ
src/node/search.rs	78.11% <100.00%> (ø)
src/router.rs	90.83% <100.00%> (ø)

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #140 will not alter performance

_{Comparing 139-remove-smallvec-usage (c78fcba) with main (f41a203)}

Summary

✅ 16 untouched benchmarks