Replace libdparse with DMD in UndocumentedDeclarationCheck #556

Job	Run time
Run all tests (dmd-latest, dmd, ubuntu-22.04, make)	2m 35s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, current)	1m 32s
Run all tests (dmd-latest, dmd, ubuntu-22.04, dub, min libdparse)	1m 35s
Run all tests (dmd-latest, dmd, windows-latest, make)	2m 26s
Run all tests (dmd-latest, dmd, windows-latest, dub, current)	2m 46s
Run all tests (dmd-latest, dmd, windows-latest, dub, min libdparse)	2m 47s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, make)	3m 27s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, current)	1m 56s
Run all tests (ldc-latest, ldmd2, ubuntu-22.04, dub, min libdparse)	2m 0s
Run all tests (ldc-latest, ldmd2, macos-latest, make)	4m 45s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, current)	2m 12s
Run all tests (ldc-latest, ldmd2, macos-latest, dub, min libdparse)	2m 10s
Run all tests (ldc-latest, ldmd2, windows-latest, make)	6m 4s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, current)	3m 39s
Run all tests (ldc-latest, ldmd2, windows-latest, dub, min libdparse)	3m 49s
Run all tests (dmd-latest, gdc-12, ubuntu-22.04, make)	6m 24s
Run all tests (dmd, macos-13, dub, current)	3m 26s
	53m 33s

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