[Feature Request]: Subscribe to search results

### 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

At times it is interesting to follow some keywords or searches. For example I am interested in some scientists that give talks and would be cool to get to subscribe to a search result based on their names.

### Proposed Solution

Subscribe to search results.

### Alternatives Considered

I am unsure what to add here.

### Issue Labels

new feature

### Additional Information

_No response_