Now users can download videos to watch offline and the player will also use the offline copy if available.

[Shivamvashist]

Offline Videos

PR Fixes:

• 1 Users can download videos for offline use.
• 2 The player will automatically use the offline copy if available.

Resolves #1838 https://github.com/code100x/cms/issues/1838

Checklist before requesting a review

• I have performed a self-review of my code
• I assure there is no similar/duplicate pull request regarding same issue

[Shivamvashist]

@devsargam @hkirat can u please take a look

[Shivamvashist]

hi @hkirat, requesting you to review this PR.