Merge branch 'feat/context-service' into 'develop'

.gitlab-ci.yml

manifests/.gitlab-ci.yml

manifests/contextservice.yaml

manifests/deviceservice.yaml

manifests/prometheus.yaml

manifests/redis.yaml

report_coverage_all.sh

report_coverage_context.sh

report_coverage_device.sh

run_integration_tests.sh

run_unitary_tests.sh

src/common/database/Factory.py

src/common/database/api/Constants.py

src/common/database/api/Database.py

src/common/database/api/Exceptions.py

src/common/database/api/context/Context.py

src/common/database/api/context/Device.py

src/common/database/api/context/Endpoint.py

src/common/database/api/context/Link.py

src/common/database/api/context/LinkEndpoint.py