refactor(transformer/legacy-decorator): eliminate unreliable identification of metadata

[Dunqing]

Fixes: #13215 (review)

Collect metadata and store them in a VecDeque, and take them when transforming the class decorators in the exit_class side, which can eliminate the unreliable check of span.is_unspanned for metadata decorators

[Dunqing]

• refactor(transformer/legacy-decorator): eliminate unreliable identification of metadata #13227 👈 (View in Graphite)
• main

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[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #13227 will not alter performance

_{Comparing 08-20-refactor_transformer_decorator_eliminate_unreliable_identification_of_metadata (3c27130) with main (d27a04b)¹}

Summary

✅ 34 untouched benchmarks

Footnotes

1. No successful run was found on main (e84ae8b) during the generation of this report, so d27a04b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩