2: Use tuples for all AST collection fields (instead of lists)

[corydolphin]

Prepares AST for immutability by using tuples instead of lists for
collection fields. This aligns with the JavaScript GraphQL library
which uses readonly arrays, and enables future frozen datastructures.

Note: It looks like you can't easily make stacked PRs in an open source repo you do not have write access to, since the merge base does not exist in the remote.

[codspeed-hq]

Merging this PR will not alter performance

Summary

✅ 14 untouched benchmarks
🆕 4 new benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
🆕	test_pickle_large_query_encode	N/A	110.8 ms	N/A
🆕	test_pickle_large_query_roundtrip	N/A	318.6 ms	N/A
🆕	test_parse_large_query	N/A	418 ms	N/A
🆕	test_pickle_large_query_decode	N/A	207.8 ms	N/A

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_{Comparing corydolphin:use-tuples-for-all-ast (83c2dd6) with main (283d002)}