Move bridge C sources to src/native_bridge/ (consolidation step 1, ta… #34

Job	Run time
cibuildwheel (ubuntu-24.04-arm)	1m 6s
cibuildwheel (ubuntu-24.04)	38s
Android cross-build (x86_64, Py 3.12)	31s
Android cross-build (x86_64, Py 3.13)	18s
Bridge example iOS round-trip (Python 3.13)	6m 44s
Bridge example macOS round-trip (Python 3.14)	3m 5s
Android cross-build (armeabi-v7a, Py 3.12)	22s
cibuildwheel (windows-latest)	1m 16s
Android cross-build (arm64-v8a, Py 3.12)	27s
Android cross-build (arm64-v8a, Py 3.14)	16s
Bridge example macOS round-trip (Python 3.13)	3m 26s
Bridge example iOS round-trip (Python 3.12)	11m 51s
Bridge example iOS round-trip (Python 3.14)	6m 13s
Android cross-build (arm64-v8a, Py 3.13)	17s
Bridge example macOS round-trip (Python 3.12)	2m 56s
Android cross-build (x86_64, Py 3.14)	18s
Bridge example Android round-trip (Python 3.14)	6m 56s
Bridge example Android round-trip (Python 3.13)	7m 10s
Bridge example Android round-trip (Python 3.12)	6m 46s
Bridge example Windows round-trip (Python 3.14)	2m 15s
Bridge example Windows round-trip (Python 3.12)	2m 1s
Bridge example Linux AMD64 round-trip (Python 3.12)	1m 35s
Bridge example Linux ARM64 round-trip (Python 3.12)	2m 17s
Bridge example Linux AMD64 round-trip (Python 3.13)	2m 39s
Bridge example Linux ARM64 round-trip (Python 3.13)	1m 57s
Bridge example Linux AMD64 round-trip (Python 3.14)	1m 44s
Bridge example Windows round-trip (Python 3.13)	2m 10s
Bridge example Linux ARM64 round-trip (Python 3.14)	1m 44s
	1h 18m 58s

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