SecretsManager: Introduce keeper store (#105557)

* SecretsManager: Introduce secret database wrapper

Co-authored-by: PoorlyDefinedBehaviour <brunotj2015@hotmail.com>
Co-authored-by: Leandro Deveikis <leandro.deveikis@gmail.com>
Co-authored-by: Dana Axinte <53751979+dana-axinte@users.noreply.github.com>
Co-authored-by: Matheus Macabu <macabu@users.noreply.github.com>

* SecretsManager: Introduce db migrator with keeper table

Co-authored-by: PoorlyDefinedBehaviour <brunotj2015@hotmail.com>
Co-authored-by: Leandro Deveikis <leandro.deveikis@gmail.com>
Co-authored-by: Dana Axinte <53751979+dana-axinte@users.noreply.github.com>
Co-authored-by: Matheus Macabu <macabu@users.noreply.github.com>

* SecretsManager: Introduce keeper store

Co-authored-by: Leandro Deveikis <leandro.deveikis@gmail.com>
Co-authored-by: Dana Axinte <53751979+dana-axinte@users.noreply.github.com>
Co-authored-by: Matheus Macabu <macabu@users.noreply.github.com>

* new line

* without query listByNameSecureValue

* remove unused extractSecureValues for now

* SecretsManager: Add keeper integration tests

Co-authored-by: Leandro Deveikis <leandro.deveikis@gmail.com>
Co-authored-by: Dana Axinte <53751979+dana-axinte@users.noreply.github.com>
Co-authored-by: Matheus Macabu <macabu@users.noreply.github.com>

---------

Co-authored-by: PoorlyDefinedBehaviour <brunotj2015@hotmail.com>
Co-authored-by: Leandro Deveikis <leandro.deveikis@gmail.com>
Co-authored-by: Matheus Macabu <macabu@users.noreply.github.com>

.github/CODEOWNERS

@@ -177,6 +177,7 @@
 /pkg/tests/apis/query @grafana/grafana-datasources-core-services
 /pkg/tests/apis/alerting @grafana/grafana-app-platform-squad @grafana/alerting-backend
 /pkg/tests/api/correlations/ @grafana/datapro
+/pkg/tests/apis/secret/ @grafana/grafana-operator-experience-squad
 /pkg/tsdb/grafanads/ @grafana/grafana-backend-group
 /pkg/tsdb/opentsdb/ @grafana/partner-datasources
 /pkg/util/ @grafana/grafana-backend-group