Custom stickers and sticker market search

### Your use case

#### What would you like to do?
Add option to make sticker repositories
Add option to search stockers in sticker market
#### Why would you like to do it?
Because of small amount of stickers market
#### How would you like to achieve it?
Add option to add repo

Repo url example: stickers.example.net/repo/index.txt

And index.txt example:

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

### Are you willing to provide a PR?

No