Add support for unparsable policies in experimental 'tolerant-ast' feature #3631

Job	Run time
Cargo SemVer Checks (stable)	5m 34s
build_and_test / Build and Test (stable)	14m 41s
build_and_test / cargo deny	25s
build_and_test / clippy (stable)	1m 19s
build_and_test / format (stable)	5s
build_and_test / msrv	2m 38s
build_and_test / run wasm build script (ubuntu-latest)	6m 4s
build_and_test / run wasm build script (macos-latest-large)	4m 55s
build_and_test / run wasm build script (macos-latest)	4m 57s
Check coverage criteria	16s
	40m 54s

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