Add POST /Api/Plugins/Update

[Abrynos]

Checklist

• I read and understood the Contributing Guidelines.
• This is not a duplicate of an existing merge request.
• I believe this falls into the scope of the project and should be part of the built-in functionality.
• My code follows the code style of this project.
• I have added tests to cover my changes, wherever they are necessary.
• All new and existing tests pass.

Changes

Adds new API endpoint in preparation for ASF-ui/1668

New functionality

POST /Api/Plugins/Update

Changed functionality

None

Removed functionality

None

Additional info

Thank you for considering the inclusion of this merge request

[JustArchi]

Thanks! 🏆