DLT component (and related) improvements

Common:

• Extended common/object_factory
• Added DLT_GATEWAY ServiceName for test and debug purposes
• Implemented MockMessageBroker for test and debug purposes
• Extended MockServicerImpl_Context with MockMessageBroker and refactored code
• Implemented MockServicerImpl_DltGateway
• Extended deploy.sh script to support DLT components
• Removed unneeded genproto.sh script

Context:

• Improved Context/EventsCollector generic client

DLT:

• Separated DLT component into Connector and Gateway
• Implemented MockBockchain component exposing DLT Gateway API to facilitate debugging
• Implemented/Extended/Corrected Dockerfiles, manifests, etc. for DLT components
• Implemented preliminary version of CI/CD pipeline definition for DLT (still not integrated in pipeline)

DLT Connector:

• Implemented DltConnectorClient
• Implemented DltEventsCollector
• Implemented DltGatewayClient
• Initial (incomplete) implementation of DltConnector
• Initial (incomplete) unitary test for DltConnector

DLT Gateway:

• Extended logic of DltGateway