CI: add Winget Releaser workflow

[sitiom]

Reopening from #975 since the windows-aarch64 issue has been resolved now:

• Continuation of Packaging for scoop (Windows), Chocolatey (Windows), pkg (FreeBSD) #320 (comment)

This action automatically generates manifests for Winget Community Repository (microsoft/winget-pkgs) and submits them.

Fastfetch has been added to Winget (microsoft/winget-pkgs#154718), and this workflow will be used to update it.

Before merging this:

1. Add a classic PAT with public_repo scope as a repository secret named WINGET_TOKEN.

2. Fork microsoft/winget-pkgs under @fastfetch-cli. The action will use that fork for making a branch and creating a PR with the upstream winget-pkgs repository on every release.
3. Install Pull on the winget-pkgs fork to ensure that it is constantly updated.

If you want to see an example of a PR created using this action, see microsoft/winget-pkgs/pulls (Pull request has been created with WinGet Releaser).