#2514 Add MongoDB QL plugin

[helorymarceau]

Adds a new MongoDB QL action plugin inspired by Cassandra Exec. It allows executing instructions in JSON format on a MongoDB database via the runCommand() method from the MongoDB Java driver.

To ensure consistency and reuse existing MongoDB classes, all MongoDB-related classes and resources have been moved to plugins/tech/mongodb, following the same structure as plugins/tech/cassandra.

Changes:

• Existing MongoDB transform classes, generic classes, resources and tests relocated to plugins/tech/mongodb
• New ActionMql.java and ActionMqlDialog.java classes for the plugin
• Corresponding unit tests under plugins/tech/mongodb/src/test
• Integration tests
• Documentation
• pom.xml files updated accordingly

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