Expose user-defined callables into Python #9015

Job	Run time
Format	14s
Format Q# Files	49s
Clippy	41s
Build and test (windows-latest)	10m 29s
Integration tests (windows-latest)	10m 20s
Rust Unit tests (windows-latest)	7m 3s
Integration tests (ubuntu-latest)	6m 59s
Check web files	29s
Rust Unit tests (ubuntu-latest)	3m 7s
Integration tests (macos-14)	7m 7s
Rust Unit tests (macos-14)	3m 0s
Build and test (ubuntu-latest)	6m 9s
Build and test (macos-14)	6m 21s
Status Check	0s
	1h 2m 48s

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