ci: add winget releaser workflow

[sitiom]

• Resolves Support for winget #735

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

lsd has been added to Winget in microsoft/winget-pkgs#118210, 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. You can go to this URL to create it: https://github.com/settings/tokens/new?scopes=public_repo

2. Fork https://github.com/microsoft/winget-pkgs under @lsd-rs. 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).

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TODO

• Use cargo fmt
• Add necessary tests
• Add changelog entry
• Update default config/theme in README (if applicable)
• Update man page at lsd/doc/lsd.md (if applicable)

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