Add ServiceLoader for compatible with plugin.discovery=service_load

[chimeyrock999]

Description:

This pull request addresses Issue #293, which reports missing ServiceLoader manifests for Kafka Connect plugins that lead to extended plugin loading times. The issue was identified in the plugin configuration for iceberg-kafka-connect-runtime-hive version 0.6.19.

Changes Made:

• Added missing ServiceLoader manifests to ensure proper plugin discovery and loading. Included correct SPI entries for transformations and connectors in the META-INF/services/ directory of the plugin JAR files.

[chimeyrock999]

Close due to duplicate pull request #265