refactor: extract mun_hir_input #1910

Job	Run time
Check	1m 15s
Check	1m 15s
Check Style	3m 30s
Check Style	3m 30s
Test Rust (ubuntu-latest)	4m 6s
Test Rust (ubuntu-latest)	4m 6s
Doctest Rust (ubuntu-latest)	1m 17s
Doctest Rust (ubuntu-latest)	1m 17s
Test Rust (windows-latest)	11m 12s
Test Rust (windows-latest)	14m 51s
Test C++ Runtime (ubuntu-latest)	4m 5s
Test C++ Runtime (ubuntu-latest)	4m 5s
Test Rust (macOS-latest)	4m 10s
Test Rust (macOS-latest)	4m 10s
Doctest Rust (windows-latest)	5m 23s
Doctest Rust (windows-latest)	5m 23s
Test C++ Runtime (windows-latest)	8m 53s
Test C++ Runtime (windows-latest)	8m 53s
Test mdbook	3m 52s
Test mdbook	3m 52s
Doctest Rust (macOS-latest)	1m 27s
Doctest Rust (macOS-latest)	1m 27s
Test C++ Runtime (macOS-latest)	2m 42s
Test C++ Runtime (macOS-latest)	2m 42s
	1h 47m 23s

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