Add JDBC-based source coordination store plugin

[lawofcycles]

Description

Adds a new jdbc source coordination store plugin backed by a relational database.

The plugin uses standard SQL operations to implement the SourceCoordinationStore interface.

Capability	Implementation
Conditional create	INSERT with duplicate key check
Optimistic locking	UPDATE ... WHERE version = ?
Partition acquisition	Status-based query with priority ordering
TTL cleanup	Scheduled deletion of expired COMPLETED partitions

Configuration example

source_coordination:
 store:
   jdbc:
     url: "jdbc:postgresql://localhost:5432/dataprepper"
     username: "dp_user"
     password: "dp_pass"

Tested with PostgreSQL and MySQL. Integration tests run against PostgreSQL by default and can be configured for MySQL via system properties. Also verified end-to-end with OpenSearch Source and Iceberg Source pipelines on both databases, including TTL-based cleanup of completed partitions.

Issues Resolved

Resolves #6740

Check List

• New functionality includes testing.
• New functionality has a documentation issue. Please link to it in this PR.
  • New functionality has javadoc added
• Commits are signed with a real name per the DCO

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