Validate default values at schema definition #5545

Job	Run time
test MSRV	2m 44s
coverage	1m 14s
lint	48s
test-debug 3.13	41s
test on ubuntu	2m 0s
test-debug pypy3.10	1m 16s
test-pydantic-integration	1m 14s
test on macos	1m 48s
test on windows	4m 34s
test 3.8	2m 13s
rust benchmarks	2m 46s
build sdist	20s
test 3.9	1m 39s
test 3.10	1m 39s
test 3.11	1m 41s
build-wasm-emscripten	2m 17s
test 3.12	1m 35s
test 3.13	1m 37s
test pypy3.9	2m 0s
test pypy3.10	1m 55s
build on ${{ matrix.os }} (${{ matrix.target }} - ${{ matrix.interpreter \|\| 'all' }}${{ (((matrix.os == 'linux') && format(' - {0}', (((matrix.manylinux == 'auto') && 'manylinux') \|\| matrix.manylinux))) \|\| '') }})	0s
build pgo-optimized on ${{ matrix.os }} / ${{ matrix.interpreter }}	0s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	2s
release	0s
	36m 3s

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