* add check for access to rule's data source in GET APIs
* use more general method GetAlertRules instead of GetNamespaceAlertRules.
* remove unused GetNamespaceAlertRules.
Tests:
* create a method to generate permissions for rules
* extract method to create RuleSrv
* add tests for RouteGetNamespaceRulesConfig
* rename GetRuleGroupAlertRules to GetAlertRules
* make rule group optional in GetAlertRulesQuery
* simplify FakeStore. the current structure did not support optional rule group
* do not include update if no diff
* refactor calculate changes to include diff (and log)
Co-authored-by: George Robinson <george.robinson@grafana.com>
* Update API controller
- add validation of rules API model
- add function to calculate changes between the submitted alerts and existing alerts
- update RoutePostNameRulesConfig to validate input models, calculate changes and apply in a transaction
* Update DBStore
- delete unused storage method. All the logic is moved upstream.
- upsert to not modify fields of new by values from the existing alert
- if rule has UID do not try to pull it from db. (it is done upstream)
* Add rule generator
