feat: Reference schema support (#800) #3021

Job	Run time
test_min_deps (windows-latest)	1m 8s
test_min_deps (macos-latest)	46s
test_min_deps (ubuntu-latest)	45s
Integration Tests (pdm.lock)	28s
Integration Tests (pdm.minimal.lock)	28s
test (3.9, ubuntu-latest)	1m 30s
test (3.9, windows-latest)	1m 52s
test (3.9, macos-latest)	1m 43s
test (3.10, ubuntu-latest)	1m 25s
test (3.10, macos-latest)	1m 59s
test (3.10, windows-latest)	1m 48s
test (3.11, ubuntu-latest)	1m 30s
test (3.12, ubuntu-latest)	1m 29s
test (3.11, windows-latest)	1m 53s
test (3.12, windows-latest)	1m 53s
test (3.12, macos-latest)	50s
test (3.13, ubuntu-latest)	1m 32s
test (3.13, windows-latest)	2m 6s
test (3.13, macos-latest)	49s
test (3.11, macos-latest)	1m 8s
Combine & check coverage	12s
	27m 14s

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