Using case insensitive storage type names

[evindj]

This PR addresses issue #996 and ensures that catalogs can be created or updated with lower case/ case insensitive characters. The change short circuits the de-serialization process to make everything storage type upper case before continuing on de-serialization.

How I tested the change:

• Added unit tests for case insensitive StorageConfigInfo.
• Added tests for creating/updating catalogs with case insensitive storage types

Other tests ran
Integration test with ./gradlew :polaris-runtime-service:intTest --tests "ManagementServiceIT.*"
all tests passed
ran regtests with env POLARIS_HOST=localhost ./regtests/run.sh
all tests also passed.

The one thing I am still a bit skeptical about is performance. I would expect the impact to be minimal given that payloads are usually small. However, it would be nice to have some sort of benchmark to run against the change.

Checklist

• 🛡️ Don't disclose security issues! (contact security@apache.org)
• 🔗 Clearly explained why the changes are needed, or linked related issues: Fixes #
• 🧪 Added/updated tests with good coverage, or manually tested (and explained how)
• 💡 Added comments for complex logic
• 🧾 Updated CHANGELOG.md (if needed)
• 📚 Updated documentation in site/content/in-dev/unreleased (if needed)

[dimas-b]

Related dev discussion: https://lists.apache.org/thread/12fqdqnh6239r0ko7tp3ll5vg6ryy4f2