[ty] Add Tanjun benchmark

[MichaReiser]

As discussed in #18714 (comment)

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #18850 will degrade performances by 11.76%

_{Comparing micha/tanjun (5e4b235) with main (a6ad8fb)}

Summary

❌ 1 (👁 1) regressions
✅ 6 untouched benchmarks
🆕 1 new benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
👁	large[sympy]	47.2 s	53.5 s	-11.76%
🆕	small[tanjun]	N/A	4 s	N/A

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.