[AIDX-192] Added claudflare-agent-starter sample

[PavelKorobchuk]

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Description

Added claudflare-agent-starter sample from https://github.com/auth0-lab/cloudflare-agents-starter

References

AIDX-192

Testing

Describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

Please include any manual steps for testing end-to-end or functionality not covered by unit/integration tests.

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• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch