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Add instance support to attrs.fields() ( 1529)

Add instance support to attrs.fields() ( 1529): a task in repo2rlenv-commit-runtime-test: repo2rlenv-commit-runtime (Harbor dataset). Title: Allow attrs class object as input of attrs.fields

The task

**Title:** Allow attrs class object as input of attrs.fields

Part of AdithyaSK/repo2rlenv-commit-runtime-test.