[FEATURE REQUEST] Add support for github-cli

[Symb0x76]

Please confirm these before moving forward.

• I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
• This proposal is a completely new feature. If you want to suggest an improvement or an enhancement, please use this template.

Describe the new feature

Using github-cli, Uniget can easily check and download new releases of watched repos. If possible, auto-install would be better.

Describe how this new feature could help users

No need to check updates via github

[AJolly]

I'd love to be able to point to a github repo!

[Symb0x76]

Here