feat: Reference schema support (#800) #3001

Job	Run time
test_min_deps (ubuntu-latest)	42s
Integration Tests (pdm.minimal.lock)	29s
test_min_deps (macos-latest)	46s
Integration Tests (pdm.lock)	36s
test_min_deps (windows-latest)	1m 27s
test (3.9, macos-latest)	1m 18s
test (3.10, windows-latest)	2m 2s
test (3.10, macos-latest)	1m 33s
test (3.9, windows-latest)	2m 22s
test (3.12, macos-latest)	1m 5s
test (3.11, macos-latest)	1m 7s
test (3.11, ubuntu-latest)	1m 23s
test (3.12, windows-latest)	2m 52s
test (3.13, windows-latest)	2m 20s
test (3.9, ubuntu-latest)	1m 27s
test (3.13, ubuntu-latest)	1m 23s
test (3.13, macos-latest)	52s
test (3.11, windows-latest)	1m 57s
test (3.12, ubuntu-latest)	1m 23s
test (3.10, ubuntu-latest)	1m 15s
Combine & check coverage	12s
	28m 31s

Provide feedback