[Feature Request]: Allow whitelisting of channels from Sponsorblock skips

### 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

You can only set a global setting for Sponsorblock, even if you want to see sponsor segments of some YouTubers.

### Proposed Solution

Add a list of channels excluded from Sponsorblock, either for each segment category by itself or for the whole Sponsorblock functionality.

### Alternatives Considered

None as far as I know

### Issue Labels

improvement to existing feature, new optional setting

### Additional Information

_No response_