fix: support sequence metric attributes in view aggregation keys

[naveenvenk17]

Fixes #3750.

Summary

• Use the SDK's attribute-key helper for metric view aggregation keys instead of frozenset(attributes.items()).
• Normalize sequence-valued attributes to tuples for the private aggregation key while preserving the original datapoint attributes.
• Broaden the existing get_dict_as_key helper from list values to non-string sequence values.
• Add a regression test for list and tuple metric attributes.

Evidence

• .tox\\py312-test-opentelemetry-sdk\\Scripts\\pytest.exe opentelemetry-sdk\\tests\\metrics\\test_view_instrument_match.py -q passed: 11 passed.
• uv run ruff check opentelemetry-sdk\\src\\opentelemetry\\sdk\\metrics\\_internal\\_view_instrument_match.py opentelemetry-sdk\\src\\opentelemetry\\sdk\\util\\__init__.py opentelemetry-sdk\\tests\\metrics\\test_view_instrument_match.py passed.
• .tox\\lint-opentelemetry-sdk\\Scripts\\pylint.exe opentelemetry-sdk\\src\\opentelemetry\\sdk\\metrics\\_internal\\_view_instrument_match.py opentelemetry-sdk\\src\\opentelemetry\\sdk\\util\\__init__.py opentelemetry-sdk\\tests\\metrics\\test_view_instrument_match.py passed: 10.00/10.
• Earlier full SDK tox run for this branch with uv run tox -e py312-test-opentelemetry-sdk -- opentelemetry-sdk/tests/metrics/test_view_instrument_match.py passed: 1098 passed, 13 skipped.
• git diff --check passed.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: naveenvenk17 / name: naveenvenk17 (dcb6629)

[github-actions]

This PR has been automatically marked as stale because it has not had any activity for 14 days. It will be closed if no further activity occurs within 14 days of this comment.
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[lzchen]

@naveenvenk17

I think there's a PR out that addresses this issue already? #5303

[xrmx]

This needs a changelog entry in .changelog, more details in CONTRIBUTING.md

[tammy-baylis-swi]

Thanks for contributing! Going to keep this in No Status for now while #5303 and #5266 get sorted.

[github-actions]

This PR has been automatically marked as stale because it has not had any activity for 14 days. It will be closed if no further activity occurs within 14 days of this comment.
If you're still working on this, please add a comment or push new commits.

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