feat: remove duplicate .clang-format and move it to top layer #90

Job	Run time
Build source distribution	22s
Build wheels on ubuntu-latest	8m 31s
Build wheels on ubuntu-22.04-arm	15m 35s
Build wheels on macos-latest	16m 20s
Publish to TestPyPI (auto)	0s
Publish (manual)	0s
	40m 48s

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