gh-107137: Add _PyTupleBuilder API to the internal C API #81951

Job	Run time
Check for source changes	12s
Check if generated files are up to date	7m 44s
Windows (x86)	26m 44s
Windows (x64)	26m 42s
Ubuntu	18m 58s
Address sanitizer	15m 54s
Ubuntu SSL tests with OpenSSL (1.1.1u)	5m 19s
Ubuntu SSL tests with OpenSSL (3.0.9)	3m 53s
Ubuntu SSL tests with OpenSSL (3.1.1)	4m 49s
Docs	0s
Hypothesis tests on Ubuntu	12m 19s
macOS	17m 36s
All required checks pass	2s
	2h 20m 12s

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