Introduce `ParseCallbacks::header_file` #1733

Job	Run time
msrv	6m 12s
minimal	26s
docs	37s
check-cfg	33s
quickchecking	37s
rustfmt-clippy	42s
test-book	8s
test-expectations (ubuntu-latest)	2m 16s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	4m 7s
test-expectations (macos-latest)	4m 15s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	3m 9s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	2m 49s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	3m 43s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	3m 39s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	4m 26s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	4m 38s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	4m 4s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	4m 24s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	2m 55s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	3m 19s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	3m 3s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	4m 6s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	4m 3s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	3m 52s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	4m 43s
test (ubuntu-latest, 9.0, 0, 0, 1)	2m 8s
test (macos-latest, 9.0, 0, 0, 0)	2m 7s
	1h 21m 1s

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