Add `get_module_ast(path)` method to the `Library` trait #4156

Job	Run time
Test Rust stable on ubuntu with --profile test-release	8m 14s
Test Rust stable on ubuntu with --profile test-release --doc	4m 16s
Test Rust nightly on ubuntu with --profile test-release	8m 44s
Clippy	47s
no-std (stable, wasm32-unknown-unknown)	1m 3s
Test Rust nightly on ubuntu with --profile test-release --doc	5m 39s
Check Rust stable on ubuntu with --all-targets --no-default-features	1m 19s
no-std (nightly, wasm32-unknown-unknown)	1m 6s
Check Rust stable on ubuntu with --all-targets	1m 38s
rustfmt	11s
Check Rust stable on ubuntu with --all-targets --all-features	1m 34s
Test Rust nightly on windows-2022	0s
Check Rust nightly on ubuntu with --all-targets --no-default-features	1m 6s
Check Rust nightly on ubuntu with --all-targets	1m 25s
Check Rust nightly on ubuntu with --all-targets --all-features	1m 46s
	38m 48s

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