Merge in XRCA/teraflow from vhallivu/XR_DRIVER_EMULATE_ENDPOINTS to xr_development

Squashed commit of the following:

commit da5b46937d8f0dd87f535e3d736dc1d9e2043e94
Author: Ville Hallivuori <VHallivuori@infinera.com>
Date:   Mon Aug 8 15:21:16 2022 +0300

    Updates to emulation

commit b9d9e566f4622f85767c85b72494fbb33896de60
Author: Ville Hallivuori <VHallivuori@infinera.com>
Date:   Mon Aug 8 13:49:55 2022 +0300

    Add XR constellation icon for topology

commit 6d24a643f11ecb684043332500c2ee8b2768e900
Author: Ville Hallivuori <VHallivuori@infinera.com>
Date:   Mon Aug 8 12:56:16 2022 +0300

    Improved XR service creation stubs

commit 7d31fd2ecc67848368e2d0eddb616faa6115128d
Author: Ville Hallivuori <VHallivuori@infinera.com>
Date:   Mon Aug 8 08:07:10 2022 +0300

    Eulation for XrDriver endpoints

- added helper methods to copy/update grpc messages: config_rules, constraints, endpoint_ids, service_ids
-  extended Context ConstraintModel to support different types of constraints
- extended EndpointModel with get_endpoint helper method
- extended SliceModel to incorporate config rules

- Arranged .gitignore & .gitkeep files in common proto folder
- Created specific run_tests_locally script for Context component
- Moved imports from *.proto folder to common.proto folder
- Adapted common.tools.object_factory to new proto definitions for ConfigRule and Constraint
- Extended common.tools.type_checkers to new proto definitions for ConfigRule and Constraint
- Removed context's genproto.sh script
- Adapted Events generated to new timestamp data type
- Minor code and linting fixing

- initial skeleton (not functional)

- added helper methods to object_factory

- defined unified constants for all micro-services
- defined common settings getter methods
- defined generic gRPC servicer
- defined generic Rest servicer
- defined common MockServicer for Monitoring component
- removed old common/tests MockService class; to be replaced by new generic gRPC servicer
- minor code formatting/styling

- code styling and cleanup

new development of microwave device - implemented the Api to get configurations, create and delete services

- Complete rework of Database API
- Integration of Database API into Context
- Improvement of API

This commit is not a final implementation, just an intermediate backup.

Common / Context / Device / Service:
- Improvements in unitary testing
- Extended assertion validators tor testing
- Factorized service implementation code to improve testability, reusability and increase code coverage

Factorization of code between services and minor unitary testing improvements. (Not finished, it is just a backup)

This reverts merge request !3