FEAT-#7401: Implement DataFrame/Series.attrs #16137

Job	Run time
execution-filter	5s
python-filter	1s
lint (flake8)	14s
Test API, headers and no-engine mode	1m 57s
lint (mypy)	2m 12s
test-asv-benchmarks	15s
test-clean-install-ubuntu	3m 7s
Test BaseOnPython execution, Python 3.9"	17m 7s
test-internals	6m 44s
test-clean-install-windows	1m 49s
test experimental	8m 27s
test-ubuntu (engine python, python 3.9, group_1)	21m 12s
test-spreadsheet (engine ray, python 3.9)	2m 6s
test-ubuntu-sanity (engine ray, python 3.9)	19m 45s
test-windows (engine python, python 3.9, group_1)	32m 32s
test-spreadsheet (engine dask, python 3.9)	2m 1s
test-ubuntu-sanity (engine dask, python 3.9)	41m 31s
test-ubuntu-sanity (engine unidist, python 3.9)	16m 12s
test-windows-sanity (engine ray, python 3.9)	21m 8s
test-ubuntu (engine unidist ${{ matrix.unidist-backend }}, python ${{ matrix.python-version }})	0s
test-native-dataframe-mode python ${{ matrix.python-version }})	0s
test-windows-sanity (engine dask, python 3.9)	31m 43s
test-windows-sanity (engine unidist, python 3.9)	23m 56s
merge-coverage-artifacts	2s
upload-coverage	27s
	4h 14m 33s

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