Description

Add the convert module to get the both bvid and avid of the video.

Changes Proposed

• add bvid and avid convert module
• add some test cases

Who Can Review?

@timerring

Checklist

• Code has been reviewed
• Code complies with the project's code standards and best practices
• Code has passed all tests
• Code does not affect the normal use of existing features
• Code has been commented properly
• Documentation has been updated (if applicable)
• Demo/checkpoint has been attached (if applicable)