Close #28

I have used a new Markdown text display control. Currently, it is a new control that combines Markdig and CommunityToolkit's MarkdownTextBlock, which theoretically has better parsing capabilities.

PR type

What is the purpose of this PR?

• Feature

What is the current behavior?

The current conversation content is displayed as plain text without any formatting, which may make it less readable.

What is the new behavior?

Since GPT defaults to organizing formatted content in Markdown, we can assume that Markdown is the default language for transmitting content in GPT. Therefore, a new control is created to enable native rendering using WinUI platform controls.

PR checklist

Please check that your PR meets the following requirements:

• App successfully launched
• New components
  • For controls, the controls have been placed in the Controls folder of the main project
• File headers have been added to all source files
• NOT Contains breaking updates

Remark

I haven't used MarkdownTextBlock in workflows or similar scenarios, where I believe precise text output is more important.