[Feature Request]: Transcripts

### Guidelines

- [X] I have searched the issue tracker for [open](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aopen+is%3Aissue) and [closed](https://github.com/FreeTubeApp/FreeTube/issues?q=is%3Aissue+is%3Aclosed) issues that are similar to the feature request I want to file, without success.
- [X] I have searched the [documentation](https://docs.freetubeapp.io/) for information that matches the description of the feature request I want to file, without success.
- [X] This issue contains only one feature request.

### Problem Description

Video transcripts aren't available within the app.

### Proposed Solution

Similar UX to YouTube, having a text box with timestamped transcript as well as being able to save it as a text file.

### Alternatives Considered

N/A

### Issue Labels

display more information to user, new feature

### Additional Information

_No response_