Added new Dashboard API endpoints for AIC return on investment (ROI) data.

Added new Dashboard APIs.


## Added
New **Dashboards** APIs:
- `GET /v2/metrics/aic/roi/kpis`
	Get AIC ROI KPI data. Specify a monthly date range for the dashboard data using the from and to query parameters. The month should fall within the last six months.

- `GET /v2/accounts/{accountId}/metrics/aic/roi/kpis`
Get AIC ROI KPI data for accounts.
- `GET /v2/metrics/aic/roi/meeting_summary_usage`
Get AIC ROI meeting summary usage data. Specify a monthly date range for the dashboard data using the from and to query parameters. The month should fall within the last six months.
- `GET /v2/accounts/{accountId}/metrics/aic/roi/meeting_summary_usage`
Get AIC ROI meeting summary usage data for accounts.
