Add atomic SessionContext.with_extensions API #673

Job	Run time
build / lint-rust	2m 24s
build / generate-license	2m 19s
build / lint-python	11s
build / lint-toml	6s
build / check-crates-patch	0s
build / Source distribution	0s
build / Linux arm64 (3.14t)	12m 19s
build / Linux arm64 (abi3)	12m 34s
build / Linux x86_64 (3.14t)	15m 15s
build / Windows x86_64 (abi3)	13m 34s
build / Linux x86_64 (abi3)	26m 50s
build / macOS arm64 (3.14t)	7m 46s
build / macOS arm64 (abi3)	9m 42s
build / Windows x86_64 (3.14t)	3m 50s
build / macOS x86_64 (${{ matrix.python-tag }})	-1s
build / Build docs	1m 20s
build / Merge build artifacts	-1s
test / test-matrix (3.10, abi3, false)	3m 50s
test / test-matrix (3.14t, 3.14t, true)	2m 45s
test / test-matrix (3.11, abi3, false)	4m 18s
test / test-matrix (3.13, abi3, false)	4m 29s
test / test-matrix (3.12, abi3, false)	4m 18s
test / test-matrix (3.14, abi3, false)	4m 34s
	2h 12m 22s

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