feat: support null value messages (tombstones) for compacted topics #378

Job	Run time
Lint and check code	18s
Run unit tests for Python 3.10	11s
Run unit tests for Python 3.14	10s
Check Completion	2s
Wheel MacOS Universal2 - Py ${{ matrix.py.version }}	0s
Python ${{ matrix.python.version }} Wheel on Windows x64	0s
Wheel ${{ matrix.image.name }} - Py ${{ matrix.python.version }} - ${{ matrix.cpu.platform }}	0s
	41s

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