API to look up source and package directory in Python #3117

Job	Run time
check-labels / check	2s
check-diff / check	26s
building / build-toolchain (ubuntu-latest)	7m 25s
cli / test-cli (ubuntu-latest)	5m 11s
lsp / test-lsp (ubuntu-latest)	9m 29s
building / epoch / build-epoch	9m 43s
	32m 16s

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