[Feature Request]: Audio enhancements for hearing impaired

### 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

Audio enhancements options for hearing impaired:
1. An option to switch from stereo to mono
2. An option to apply loudness equalization

### Proposed Solution

Example for requested feature: [Sound Fixer](https://github.com/valpackett/soundfixer)

### Alternatives Considered

Possible solution would be to add support for web extensions

### Issue Labels

ease of use improvement, new feature

### Additional Information

_No response_