Add base entity to Mill (#134415) #1

Job	Run time
Collect information & changes data	22s
Prepare pre-commit base	49s
Check Dockerfile	12s
Prepare dependencies (3.12)	3m 5s
Check Dockerfile.dev	12s
Prepare dependencies (3.13)	4m 7s
Check script/hassfest/docker/Dockerfile	12s
Check other linters	1m 2s
Check ruff-format	10s
Check ruff	17s
Check all requirements	27s
Check hassfest	42s
Check mypy	3m 29s
Check pylint	8m 20s
Audit licenses (3.12)	22s
Audit licenses (3.13)	29s
Check pylint on tests	6m 1s
Run ${{ matrix.mariadb-group }} tests Python ${{ matrix.python-version }}	0s
Run ${{ matrix.postgresql-group }} tests Python ${{ matrix.python-version }}	0s
Split tests for full run	0s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Upload test coverage to Codecov (partial suite)	0s
Run tests Python ${{ matrix.python-version }} (${{ matrix.group }})	0s
Upload test coverage to Codecov (full suite)	0s
	30m 18s

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