feat(license): add license management and fetching functionality

[mbuckton]

• Added LicenseFetcher, LicenseServerClient, and LicenseFileStore for handling license fetching, storage, and fallback handling.
• Integrated license fetching into the Maven build lifecycle using exec-maven-plugin.
• Created unit tests for license-related functionality, including fetching and file storage.
• Updated LicenseController to support fallback licenses when fetching fails.

Jira: MSG-179

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