Creates an out-of-band Event Signaling and Management (ESAM) media point for insertion into a
running live stream at a specific match time. The media point contains signals with timing info.
To use this endpoint, ESAM media point insertion needs to be enabled in the adInsertionSettings
of the StartLiveEncodingRequest.

Out-of-band vs In-band ESAM Processing:

• Out-of-band (this endpoint): Manually trigger SCTE-35 signals by creating media points
  during a live stream. Use this when you want programmatic control over when ad breaks or
  content boundaries occur, independent of the incoming stream content.

• In-band (EsamSettings): Automatically process SCTE-35 markers already present in the
  incoming live stream. Configure EsamSettings in the
  StartLiveEncodingRequest to connect
  to a POIS endpoint that processes detected SCTE-35 messages.

Use out-of-band media points when you need to insert signals at specific times based on external
triggers or business logic, rather than relying on SCTE-35 markers present in the source stream.