FIX-#7578: Change groupby extension allow list and fix cached_property extensions

[sfc-gh-joshi]

What do these changes do?

Fixes the linked issue by calling set_name on extensions defined with the cached_property decorator, and loosens restrictions on methods that can be extended on DataFrameGroupBy and SeriesGroupBy objects.

• first commit message and PR title follow format outlined here

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• passes flake8 modin/ asv_bench/benchmarks scripts/doc_checker.py
• passes black --check modin/ asv_bench/benchmarks scripts/doc_checker.py
• signed commit with git commit -s
• Resolves BUG: Using extensions to override a cached_property causes an error #7578
• tests added and passing
• module layout described at docs/development/architecture.rst is up-to-date

[sfc-gh-mvashishtha]

Thanks for the fix. I am requesting one small change.