refactor: extract mun_hir_input #1907

Job	Run time
Check	1m 42s
Check Style	1m 23s
Test C++ Runtime (ubuntu-latest)	5m 40s
Doctest Rust (ubuntu-latest)	1m 19s
Test C++ Runtime (windows-latest)	7m 32s
Test Rust (ubuntu-latest)	5m 19s
Doctest Rust (windows-latest)	8m 0s
Test mdbook	4m 50s
Test Rust (windows-latest)	13m 11s
Test C++ Runtime (macOS-latest)	3m 11s
Doctest Rust (macOS-latest)	1m 16s
Test Rust (macOS-latest)	3m 24s
	56m 47s

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