Add --version flag to display mxmake version #89

Job	Run time
variants / UV-only (no Python) - Python 3.14	26s
lint / lint	17s
variants / UV-only (no Python) - Python 3.10	23s
variants / build (3.10, ubuntu-latest)	1m 38s
variants / build (3.14, ubuntu-latest)	1m 34s
variants / build (3.10, windows-latest)	3m 30s
variants / build (3.14, macos-latest)	1m 9s
typecheck / build	18s
tests / build (3.11, ubuntu-latest)	12s
variants / build (3.10, macos-latest)	1m 49s
variants / build (3.14, windows-latest)	3m 17s
tests / build (3.10, macos-latest)	18s
tests / build (3.13, ubuntu-latest)	13s
tests / build (3.12, macos-latest)	19s
tests / build (3.11, windows-latest)	44s
tests / build (3.10, ubuntu-latest)	15s
tests / build (3.13, windows-latest)	45s
tests / build (3.12, ubuntu-latest)	12s
tests / build (3.10, windows-latest)	43s
tests / build (3.14, windows-latest)	31s
tests / build (3.14, macos-latest)	21s
tests / build (3.13, macos-latest)	27s
tests / build (3.12, windows-latest)	34s
tests / build (3.14, ubuntu-latest)	13s
tests / build (3.11, macos-latest)	22s
Build & verify package	25s
Publish in-dev package to test.pypi.org	16s
Publish released package to pypi.org	0s
docs	0s
	21m 11s

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