Add manual trigger mode for bundle refresh

[MohamedFazil1406]

Summary

This PR adds support for a manual trigger mode for bundle refresh while preserving the existing periodic polling behavior as the default.

##Issues #65

Changes

• Added Trigger configuration with PERIODIC (default) and MANUAL modes.
• Extended BundleConfig to support the new trigger option.
• Passed the configured trigger from BundlePlugin to BundleDownloader.
• Updated BundleDownloader to skip automatic polling when the trigger is MANUAL.
• Added a refresh() method to allow bundles to be refreshed on demand.
• Added validation to reject polling configuration when using the manual trigger.
• Added unit tests covering manual trigger configuration and validation.

Testing

• Verified the project compiles successfully with:
  • ./gradlew :opa-services:compileJava
• Added unit tests for the new manual trigger functionality.
• Local MTLS integration tests require openssl, which is not available in my Windows environment, resulting in an unrelated test initialization failure.

[sspaink]

@MohamedFazil1406 thank you for working on this! can you sign your commits please for the DCO check to pass?

[MohamedFazil1406]

Thanks for the heads-up! I've signed off all the commits and force-pushed the updated branch. The DCO check should pass now.

[sspaink]

@MohamedFazil1406 looks like there are some real compilation failures, mind taking a look?

[MohamedFazil1406]

ok i will check