New knowledge management sync APIs to manage sync operations for knowledge bases, and a new deletion field to help identify removed records for Virtual Agent reports.

New Knowledge Management sync APIs and a new deleted field in Report APIs

 ## Added
- New **Knowledge Management** APIs:
	- `POST /v2/km/kbs/{kbId}/sync`
	- `GET /v2/km/kbs/{kbId}/sync/{syncId}`
## Enhancements
- New `deleted` response field in the following  **Report** APIs:
	- `GET /v2/virtual_agent/report/engagements/query_details`
	- `GET /v2/virtual_agent/report/engagements`
