Add `Sensu` metrics configurations.

- Deploy the scripts for collecting metrics.
- Add `Sensu` metrics configurations.
Add `Sensu` mutator configuration.

- Deploy the mutator script
- Add `Sensu` mutator configuration.
Add `Sensu` handler configuration for `Growthforecast`.

- Install `Growthforecast` gem.
- Deploy the handler script.
- Add `Sensu` handler configuration for `Growthforecast`.