Improve stimcirq serialization #17784

Job	Run time
Packaging test	1m 16s
Misc check	7s
Type check	1m 31s
Format check	13s
Lint check	2m 38s
Pytest Ubuntu with NumPy-2 (3.10)	7m 44s
Isolated pytest Ubuntu	8m 21s
Pytest Ubuntu with NumPy-2 (3.13)	7m 27s
Build protos	16s
Pytest Ubuntu with NumPy-2 (3.12)	7m 57s
Notebook formatting	13s
Pytest Ubuntu with NumPy-2 (3.11)	6m 43s
Pytest Ubuntu (3.10)	6m 41s
Shell check	16s
Check consistency of requirements	18s
Doc test	1m 48s
Changed files test	1m 10s
Pytest Ubuntu (3.11)	5m 58s
Pytest Ubuntu (3.12)	6m 14s
Pytest MacOS (3.12)	10m 12s
Notebook Tests against PR	10m 26s
Pytest MacOS (3.10)	9m 28s
Pytest MacOS (3.11)	8m 45s
Changed Notebooks Isolated Test against Cirq stable (partition-3)	47s
Typescript tests coverage	36s
Coverage check	14m 21s
Typescript lint check	35s
Changed Notebooks Isolated Test against Cirq stable (partition-0)	51s
Changed Notebooks Isolated Test against Cirq stable (partition-1)	58s
Pytest Windows (3.10)	9m 34s
Pytest Windows (3.12)	9m 48s
Bundle file consistency	50s
Changed Notebooks Isolated Test against Cirq stable (partition-2)	45s
Typescript tests	39s
Pytest Windows (3.11)	8m 43s
	2h 34m 9s

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