Improve stimcirq serialization #17702

Job	Run time
Misc check	4s
Format check	7s
Build protos	16s
Changed files test	1m 28s
Doc test	1m 35s
Isolated pytest Ubuntu	8m 10s
Lint check	2m 50s
Type check	1m 26s
Notebook formatting	10s
Packaging test	1m 18s
Check consistency of requirements	18s
Pytest Ubuntu with NumPy-2 (3.10)	7m 40s
Shell check	7s
Pytest Ubuntu with NumPy-2 (3.11)	7m 22s
Pytest Ubuntu (3.10)	6m 34s
Pytest Ubuntu with NumPy-2 (3.12)	8m 2s
Pytest Ubuntu with NumPy-2 (3.13)	8m 13s
Pytest Ubuntu (3.11)	6m 35s
Pytest Ubuntu (3.12)	6m 18s
Coverage check	14m 19s
Pytest MacOS (3.10)	10m 40s
Pytest MacOS (3.11)	13m 32s
Pytest MacOS (3.12)	14m 1s
Notebook Tests against PR	11m 37s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	44s
Bundle file consistency	43s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	47s
Typescript tests coverage	33s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	1m 6s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	47s
Typescript lint check	32s
Typescript tests	40s
Pytest Windows (3.10)	9m 58s
Pytest Windows (3.11)	8m 16s
Pytest Windows (3.12)	9m 57s
	2h 46m 45s

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