refactor: install clang tools on demand #587

Job	Run time
Build FreeBSD	2m 55s
Build x86_64-unknown-linux-gnu	2m 46s
Build x86_64-pc-windows-msvc	4m 36s
Build x86_64-apple-darwin	1m 59s
Build aarch64-apple-darwin	1m 53s
Build aarch64-pc-windows-msvc	5m 17s
Build aarch64-unknown-linux-musl	3m 5s
Build x86_64-unknown-linux-musl	3m 13s
Build i686-pc-windows-msvc	4m 36s
Build armv7-unknown-linux-gnueabihf	2m 48s
Build aarch64-unknown-linux-gnu	2m 51s
Test ${{ matrix.target }} - node@${{ matrix.node }}	0s
Test ${{ matrix.settings.target }} - node@${{ matrix.node }}	0s
Publish	0s
	35m 59s

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