* Add validation for grafana recipient
* Alertmanager API implementation (WIP)
* Fix encoding/decoding receiver settings from/to YAML
* Save templates together with the configuration
* update POST to apply latest config
* Alertmanager service enabled by the ngalert toggle
* Silence API integration with Alertmanager
* Apply suggestions from code review
Co-authored-by: gotjosh <josue@grafana.com>
Co-authored-by: Ganesh Vernekar <15064823+codesome@users.noreply.github.com>