Additional APIs for Alert Creation & Management

[cschneid]

Some customers have dozens of distinct applications, and want to automate the creation and editing of alerts.

We should add an API call that can create and delete alerts.

[ibrahima]

I would find this very useful for multiple application environments. A lot of our alerting is automated through AWS Cloudwatch alerts and Terraform but unfortunately the ScoutAPM alerts need to be set up manually on each environment, which can be forgotten when bringing up new environments. It would be amazing if I could us Terraform for this, but I imagine that the first step would be to add an API for these actions. Thanks!