fix: send the final video event at a delayed time interval

[phantumcode]

Issue #, if available:

Description of changes:

• update video segment processor to send the final event at a delayed time interval after the video chunk. Sending the final video event immediately after the video chunk causes the backend service to queue the final event and results in additional processing latency

Check points: (check or cross out if not relevant)

• Added new tests to cover change, if needed
• Build succeeds with all target using Swift Package Manager
• All unit tests pass
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Documentation update for the change if required
• PR title conforms to conventional commit style
• If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.