Feature: ESP32-C3 support #1894

Job	Run time
build-mingw (windows-2022, ucrt64)	2m 36s
build-linux (ubuntu-20.04, focal, clang-15, 12.2.Rel1)	3m 48s
build-mingw (windows-2022, clang64)	2m 17s
build-linux (ubuntu-20.04, focal, gcc-11, 12.2.Rel1)	3m 46s
build-linux (focal, 96b_carbon	28s
build-linux (focal, bluepill	38s
size-diff	50s
build-linux (focal, f072	33s
build-linux (focal, f3	29s
build-linux (focal, f4discovery	28s
build-linux (focal, hydrabus	27s
build-linux (focal, launchpad-icdi	27s
build-linux (focal, native	33s
build-linux (focal, stlink	32s
build-linux (focal, stlinkv3	34s
build-linux (focal, swlink	37s
	19m 3s

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