add decimal validator #3298

Job	Run time
build on ${{ matrix.platform \|\| matrix.os }} (${{ matrix.target }} - ${{ matrix.manylinux \|\| 'auto' }})	0s
rust benchmarks	3m 52s
build sdist	16s
build pgo-optimized on ${{ matrix.platform \|\| matrix.os }} (${{ matrix.interpreter }} - ${{ matrix.target }} - ${{ matrix.manylinux \|\| 'auto' }})	0s
build-wasm-emscripten	2m 55s
lint	1m 17s
coverage	2m 48s
test-debug 3.11	1m 13s
test-debug pypy3.10	2m 17s
test on ubuntu	2m 16s
test on macos	6m 29s
test on windows	5m 0s
test-pydantic-integration	3m 12s
test 3.7	2m 48s
test 3.8	2m 51s
test 3.9	3m 3s
test 3.10	2m 7s
test 3.11	2m 12s
test 3.12-dev	2m 28s
test pypy3.7	2m 44s
test pypy3.8	2m 48s
test pypy3.9	2m 39s
test pypy3.10	4m 4s
test build on ${{ matrix.target }}-${{ matrix.distro }}	0s
test build on ${{ matrix.os }}	0s
inspect-pypi-assets	0s
check	3s
release	0s
	59m 22s

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