darwin: Add DarwinSymbol methods to ObjectiveCSymbol #44

Job	Run time
build-linux-server (ubuntu-latest, aarch64)	21s
build-linux-server (ubuntu-latest, x86_64)	26s
python-app (windows-latest, 3.11)	40s
build-linux-server (ubuntu-latest, i686)	32s
python-app (windows-latest, 3.14)	35s
python-app (macos-latest, 3.10)	33s
python-app (ubuntu-latest, 3.12)	36s
python-app (macos-latest, 3.14)	41s
python-app (ubuntu-latest, 3.10)	42s
python-app (macos-latest, 3.12)	42s
python-app (windows-latest, 3.10)	34s
python-app (ubuntu-latest, 3.11)	31s
python-app (macos-latest, 3.11)	35s
python-app (windows-latest, 3.13)	35s
python-app (macos-latest, 3.13)	40s
python-app (ubuntu-latest, 3.14)	47s
python-app (ubuntu-latest, 3.13)	34s
python-app (windows-latest, 3.12)	35s
pytest	0s
	10m 39s

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