fix(utils): compare numeric attribute-filter literals as strings

[joshuarobinson]

In the attribute filter grammar, the number transformer returned a float, but compare() evaluates '=' / '!=' as
str(metadata[key]) value. Comparing a string against a float made equality on an unquoted numeric literal always fail (and inequality always succeed) for string-typed metadata, e.g. 'priority = 10' never matched {'priority': '10'}. Return the literal as a string so equality works; ordering operators are unaffected since they coerce both operands with float().

Found in merged MR !500.

Checklist

• Development PR
  • .release_notes/.unreleased.md
    • Notable changes to the client (i.e. not related to tooling, CI/CD, etc.) from this PR have been added.
• Release PR
  • CI/CD
    • The default branch pipelines are passing in both GitHub + GitLab (latter for SwiftStack E2E tests).
  • multi-storage-client/pyproject.toml
    • The package version has been bumped.
  • .release_notes/.unreleased.md
    • This file's contents have been moved into a .release_notes/{bumped package version}.md file.

Summary by CodeRabbit

• Bug Fixes
  • Improved attribute-filter comparisons involving numeric metadata values.
  • Numeric filter values are now handled consistently as strings for equality and inequality checks, while ordering comparisons continue to work numerically.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between b77536f and 210bf7d.

📒 Files selected for processing (1)

• multi-storage-client/src/multistorageclient/utils.py

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📝 Walkthrough

Walkthrough

The attribute-filter expression evaluator now preserves numeric literals as strings for equality and inequality comparisons, while ordering comparisons continue using numeric coercion.

Changes

Attribute filter comparison

Layer / File(s)	Summary
Numeric literal transformation multi-storage-client/src/multistorageclient/utils.py	AttributeFilterEvaluator.number() returns numeric tokens as strings, with comments updated to describe equality and inequality behavior.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: shunjiad

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change to numeric attribute-filter comparisons.
Description check	✅ Passed	The description clearly explains the bug, the fix, and the checklist; only the task ID reference is missing.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/mr500-attribute-filter-number-equality

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