Support case-insensitive CLI member access

[yoshibase]

Summary

Fixes #43

Allow Fire to resolve public members case-insensitively, consistent with existing hyphen/underscore handling.

Test plan

• python3 -m unittest fire.fire_test.FireTest.testFireCaseInsensitiveMember

Made with Cursor

[google-cla]

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[yoshibase]

Pausing this PR for now: the cla/google check requires signing Google's CLA, and our contributor policy currently excludes repositories that require CLA signing. The fix remains prepared locally and can be resubmitted once CLA signing is feasible. Thank you for understanding.