Add plugin support

[SommerEngineering]

We use the Lua language for plugins. Lua is integrated into .NET with Lua CSharp. There will be different types of plugins:

• Language plugins to offer AI Studio in other languages
• Configuration plugins to centrally control a standard configuration in a corporate environment through an IT department
• Assistants

More types of plugins will come over time.

[SommerEngineering]

Mandatory information:

• ID (UUID)
• Name
• Description
• Type of plugin
• Version number in the format x.x.x
• Name of authors
• Support contact (can be URL, name, email, etc.)
• Category (e.g., Text processing, image processing, business process automation, etc.)
• Planned target group (e.g., scientists, business administration, teachers, book authors, etc.)
• (optional) company
• (optional) repository URL

[SommerEngineering]

Plugin distribution:

• Worldwide: Search for GitHub Topics, see https://gist.github.com/usametov/af8f13a351a66fb05a9895f11417dd9d
• Worldwide: Search for GitLab Topics, see https://stackoverflow.com/questions/68133451/gitlab-api-filter-projects-by-topic-project-tag and https://docs.gitlab.com/api/topics/#list-projects-assigned-to-a-topic
• Within an organization: A GitLab URL is specified through configuration. Then a search is performed using topics.
• Local and in small networks: Search in directories. We search for locally installed plugins in the app's data directory and in a directory specified by an environment variable, which can also be a network drive.

Note: The distribution of configuration plugins is not supported worldwide. Configurations are only accepted from local or organizational internal sources.