Add jiff into/from python convertions #12342

Job	Run time
resolve	4s
fmt	18s
check-feature-powerset ${{ matrix.rust }}	0s
careful	0s
python${{ matrix.python-version }}-${{ matrix.platform.python-architecture }} ${{ matrix.platform.os }} rust-${{ matrix.rust }}	0s
check-msrv	1m 3s
coverage windows-latest	3m 19s
docsrs	0s
coverage macos-latest	3m 36s
coverage ubuntu-latest	3m 33s
emscripten	0s
semver-checks	2m 45s
clippy/aarch64-apple-darwin/stable	50s
test-cross-compilation ${{ matrix.os }} -> ${{ matrix.target }}	0s
clippy/x86_64-unknown-linux-gnu/stable	1m 1s
test-cross-compilation-windows	0s
test-debug	0s
clippy/powerpc64le-unknown-linux-gnu/stable	1m 3s
clippy/s390x-unknown-linux-gnu/stable	1m 4s
Free threaded tests - ubuntu-latest	3m 31s
clippy/wasm32-wasip1/stable	55s
test-version-limits	0s
valgrind	0s
Free threaded tests - macos-latest	3m 34s
clippy/x86_64-pc-windows-msvc/stable	55s
Free threaded tests - windows-latest	3m 19s
clippy/i686-pc-windows-msvc/stable	49s
clippy/x86_64-unknown-linux-gnu/beta	1m 6s
python3.12-x64 ubuntu-latest rust-nightly / build	3m 32s
python3.12-arm64 macos-latest rust-stable / build	3m 33s
python3.12-x64 macos-13 rust-stable / build	2m 21s
python3.12-x64 ubuntu-latest rust-stable / build	2m 40s
python3.12-x86 windows-latest rust-stable / build	2m 17s
python3.12-x64 windows-latest rust-stable / build	2m 49s
conclusion	1s
	49m 58s

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