Load Generator: filter candidate src/dst devices and endpoints

See merge request !96

- Added fields in load generator tab to filter src/dst candidate device and endpoint

- Added logic to filter src/dst candidate device and endpoint
- Corrected DLT recording logic

- extend load generator with device and endpoint regex selectors

WebUI component: Added delete link button

See merge request !95

- Link detail: added delete button

Added status field num_released in Load Generator and WebUI

See merge request !94

- Added status field num_released in loadgen tab

- Added logic to track and report num_released requests

- extend load generator status with num_released requests

Add Policy tab to WebUI

See merge request !91

- Minor correction in policy template

New features in Load Generator

See merge request !92

- Updated dashboard for load generator's status

- Added blocked counter

- Added blocked requests counter for load generator

- Updated dashboard for load generator's status

- Added deploy of load generator dashboard

- Updated dashboard for load generator's status

- Added parametrization for maximum number of workers
- Added preliminar dashboard for load generator's status

- Added parametrization for maximum number of workers

- extend load generator with max number of workers

- Minor cosmetic change

- Reverted change to prevent conflict

- Moved from common/method_wrappers to WebUI
- Generalized definition of dashboards
- Minor corrections in dashboards
- Corrected accounting of "not-found"/"already exists" exceptions in decorator
- Corrected type hints in decorator
- Added deployment of dashboards in deploy script

Update version of CockroachDB database (CLUSTER mode)

See merge request !90

- Added basic policy tab

- Corrected list_scalar_range method names
- Corrected form field types