perf: put visited_chunk_group_keys out of the loop and use FxHashMap

[SyMind]

Internal project performance improvement.

Before:

LOG from rspack.EnsureChunkConditionsPlugin
<t> ensure chunk conditions: 11436 ms

After:

LOG from rspack.EnsureChunkConditionsPlugin
<t> ensure chunk conditions: 3463 ms

Summary

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[SyMind]

!bench

[rspack-bot]

📝 Benchmark detail: Open

Name	Base (2024-06-11 34bb9ea)	Current	Change
10000_development-mode + exec	2.24 s ± 26 ms	2.24 s ± 21 ms	+0.16 %
10000_development-mode_hmr + exec	737 ms ± 14 ms	739 ms ± 17 ms	+0.32 %
10000_production-mode + exec	2.58 s ± 21 ms	2.58 s ± 24 ms	-0.10 %
arco-pro_development-mode + exec	1.92 s ± 78 ms	1.95 s ± 89 ms	+1.29 %
arco-pro_development-mode_hmr + exec	441 ms ± 1.3 ms	442 ms ± 1.8 ms	+0.32 %
arco-pro_production-mode + exec	3.51 s ± 71 ms	3.53 s ± 87 ms	+0.73 %
threejs_development-mode_10x + exec	1.41 s ± 15 ms	1.4 s ± 19 ms	-0.35 %
threejs_development-mode_10x_hmr + exec	802 ms ± 6.9 ms	808 ms ± 9.4 ms	+0.67 %
threejs_production-mode_10x + exec	4.71 s ± 20 ms	4.72 s ± 27 ms	+0.32 %

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approve by mistake