Allow ability to plug in custom (de)serializers for cirq_google protos #17131

Job	Run time
Type check	1m 22s
Misc check	7s
Doc test	1m 26s
Format check	7s
Lint check	4m 15s
Notebook formatting	10s
Packaging test	1m 8s
Changed files test	1m 5s
Build protos	12s
Coverage check	12m 37s
Isolated pytest Ubuntu	7m 54s
Check consistency of requirements	19s
Pytest Ubuntu (3.10)	7m 22s
Pytest Ubuntu (3.11)	6m 9s
Pytest Ubuntu with NumPy-2 (3.10)	7m 18s
Shell check	6s
Pytest Ubuntu (3.12)	7m 23s
Pytest Ubuntu with NumPy-2 (3.11)	6m 28s
Pytest Ubuntu with NumPy-2 (3.12)	7m 43s
Notebook Tests against PR	10m 7s
Pytest Ubuntu with NumPy-2 (3.13)	6m 17s
Pytest MacOS (3.10)	6m 47s
Pytest MacOS (3.11)	8m 19s
Pytest MacOS (3.12)	6m 17s
Bundle file consistency	46s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	44s
Typescript lint check	32s
Typescript tests coverage	38s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	48s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	44s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	48s
Typescript tests	47s
Pytest Windows (3.10)	11m 16s
Pytest Windows (3.11)	7m 49s
Pytest Windows (3.12)	10m 4s
	2h 25m 54s

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