Add `AsRefSource` to `PyNativeType`. #7622

Job	Run time
emscripten	0s
fmt	15s
test-debug	7m 58s
check-msrv	7m 40s
semver-checks	21s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
clippy/x86_64-apple-darwin/stable	20m 19s
coverage-windows	5s
valgrind	0s
clippy/x86_64-unknown-linux-gnu/stable	8m 28s
coverage-macos	10s
clippy/powerpc64le-unknown-linux-gnu/stable	7m 57s
coverage-ubuntu	12m 55s
clippy/s390x-unknown-linux-gnu/stable	7m 40s
clippy/wasm32-wasi/stable	7m 42s
careful	0s
clippy/x86_64-pc-windows-msvc/stable	13m 2s
clippy/i686-pc-windows-msvc/stable	12m 12s
clippy/x86_64-unknown-linux-gnu/beta	7m 53s
python3.12-x64 ubuntu-latest rust-stable / build	7m 26s
python3.12-x86 windows-latest rust-stable / build	9m 8s
python3.12-x64 windows-latest rust-stable / build	11m 39s
python3.12-x64 macos-latest rust-stable / build	8m 34s
python3.12-x64 ubuntu-latest rust-nightly / build	7m 5s
conclusion	1s
	2h 38m 30s

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