- Added extensions in Device to point to the controller node of each device

- Updated ConfigRuleModel and separated it into DeviceConfigRuleModel, ServiceConfigRuleModel, SliceConfigRuleModel
- Updated ConstraintModel and separated it into ServiceConstraintModel, SliceConstraintModel
- Updated related indexes
- Activated placeholder for device components
- Updated compose_config_rules_data and upsert_config_rules methods
- Updated compose_constraints_data and upsert_constraints
- Correction of method name SelectDevices to SelectDevice in gRPC servicer

- Added SelectDevice, SelectService, SelectSlice RPC methods
- Corrected relationship import modes
- Added options to selectively load relations according to method

- Added/Updated headers
- Added script to update copyright headers

- migrated events for Service and Slice entities
- added missing not-nulls to database fields

- corrected run_tests_locally script
- solved formatting issue with Database Engine error logging
- minor type hinting corrections
- activated event notifications for Device, EndPoint and ConfigRule

- extended grpc-to-enum tool to support arbitrary enum item names
- added PolicyRuleState enum model
- misc minor comment corrections
- misc import reorderings
- migrated Connection model and methods
- migrated PolicyRule model and methods
- removed unused files

- corrected ConfigRuleModel and methods
- corrected ConstraintModel and methods
- corrected ServiceModel and methods
- corrected ServiceEndPointModel
- added missing non-null constraints
- removed redundant column definition data
- removed unneeded lazy loading parameters
- added Service UUID generator
- implemented unitary test for Service entity

- relocated database methods
- corrected models to use single-column primary key
- corrected test cases

- cleaned up script run tests locally
- temporarily added script to automate test & coverage reporting
- reorganized unitary tests
- migration in progress to use single-column primary-key for main entities
- intermediate backup ; work in progress

- reorganized code spliting database models, enumerations, and operation methods
- separated unitary tests per entity and defined order between them
- separated unitary test for fasthasher
- modev old code to separate folder