Add benchmark instances into the integration test suite

[Dekker1]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/huub/src/solver/engine.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
crates/huub/src/solver/engine.rs	80.65% <0.00%> (+0.74%)	⬆️

... and 15 files with indirect coverage changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #158 will not alter performance

_{Comparing Dekker1:feat/bench-tests (076e0d0) with develop (2d3f537)}

Summary

✅ 14 untouched benchmarks