First functional version of Service with Service Handler for L3NM-Emulated services using Emulated Devices

Updated gRPC proto files to prevent trouble with KPI sample types in devices, also updated files related to this issue.

Deactivated some Device monitoring functionality partially implemented to enable a functional commit into develop.

Device:
- Implemented Driver API with some special resources to enable retrieving endpoints from devices, interfaces, and network instances.
- Implemented special resource_keys (_connect/*) to enable AddDevice to obtain settings used to connect to remote devices (address, port, username, password, etc.)
- Implemented Emulated Driver (only for testing)
- Implemented OpenConfig Driver (missing to implement monitoring; templates for Infinera devices to be tested with other device vendors)
- Minor bugs and code improvements
- Improved test unit to enable easy testing of vendor devices and keep credentials secret.

- reorganized some files and modules
- implemented discovery of device endpoints for OpenConfig driver
- implemented retrieval of current configuration for OpenConfig driver
- updated test units and separated in emulated and openconfig test sets

- added missing proto files in genproto.sh
- created .gitignore files to prevent sharing device credentials and data
- improved MonitoringLoops class with one thread per driver for data collection, a unique aggregation queue and one single thread for data export to monitoring
- added GetResource method to Driver API
- improved DriverFactory to select the driver that better fits with filter fields in terms of number of correspondences in filter fields. Drivers with some mismatch filter are discarded.
- implemented proper initialization and connection of drivers to real devices
- started to implement OpenConfig driver with support for Infinera Packet Routers

- Implemented Database models for KpiModel and KpiSampleType
- Added MonitorDeviceKpi to DeviceClient
- Added MonitorDeviceKpi to DeviceServiceServicerImpl (partial implementation)
- Created MonitoringLoops class (partial implementation)

- Subscriptions to be implemented

Common:
- Normalized report_coverage_*.sh scripts, and temporarily summarized results in device one for testing purposes.
- Adapted run_tests_locally.sh script for testing purposes
- Improved message synthesis of ServiceException

Context:
- Improved ConfigModel helper functions

Device (intermediate backup):
- Removed DataCache since it reduces readability of the code. Moved database one level up.
- Improved ServicerImpl and moved DataCache functionality over there.
- Added condition to prevent AddDevice request from carrying a configuration.
- Multiple pre-work required for processing configuration differences in DeviceServiceServicerImpl.

- Added method to delete config rules when action is DELETE.
- Temporary changes in run_tests_local.sh scripts

- Multiple minor bug resolutions
- DeviceClient: solved logging bug
- EmulatedDriver: solved GetConfig bug and added event to prevent double connection requests
- DriverInstanceCache, DriverFactory: Added formatting of filter fields
- DataCache: solved minor bug
- DriverAPI test unit: corrected getconfig assertion check
- Device test unit: reimplemented, first complete test after component reworking
- DataCache/DeviceTools: solved several minor bugs
- DeviceServiceServicerImpl: added removal of drivers and endpoints when device is removed.

- Corrections in Service to prevent errors in GitLab CI/CD pipeline.
- Minor improvements in random classes.