[trino] Add initial connector build and plugin skeleton

[yangshangqing95]

Summary

This PR introduces the initial build and plugin foundation for the native Fluss Trino connector proposed in #4197.

The change includes:

• an isolated fluss-trino Maven build targeting Trino 483 and JDK 25;
• a dedicated Maven Wrapper using Maven 3.9.16;
• a dedicated CI workflow for the Trino connector;
• the initial FlussPlugin, FlussConnectorFactory, and FlussConnector
  skeleton;
• build environment checks for the supported Java and Maven versions;
• Checkstyle and Spotless checks aligned with the Fluss Java code style;
• Apache RAT license checks;
• a basic test verifying registration of the fluss connector factory.

fluss-trino is intentionally kept outside the default Fluss Maven reactor. As a result, introducing the connector does not change the JDK or Maven requirements of the existing Fluss build, nor does this PR change the runtime behavior of existing Fluss modules.

The connector is not functionally complete in this PR. Metadata discovery and data reading will be implemented incrementally in follow-up PRs.

Keeping the initial build and plugin foundation as a separate change keeps the scope small and reviewable, and avoids introducing the complete connector as one large change that would be harder to review, maintain, and evolve based on
community feedback.

Test Plan

• Build and run all connector checks with JDK 25:

  cd fluss-trino
  JAVA_HOME=$(/usr/libexec/java_home -v 25) ./mvnw -B clean verify