Sync rendering of jsonrpc notifications with neovim

[slimslenderslacks]

We have 6 different jsonrpc notification methods which must each have a rendering function.

• start
• message
• functions
• functions-done
• prompts
• error

We are writing this content into a markdown buffer. In neovim, a treesitter plugin is always updating the treesitter AST as the buffer changes, and this allows a highlight module to create syntax highlighting for different sections (different roles), code fences, and errors. I think this makes it easier to distinguish the different.

If vscode can not use treesitter for this, we can add semantic tokens to the LSP to get the same effect - I assume vscode can have different color schemes based on the LSP semantic tokens. In practice, I find the default treesitter implementation in neovim to be good enough so if we add semantic tokens, it'd only be to support special syntax highlighting in vscode. @ColinMcNeil to find out what vscode requires.

None of the methods should put their json params directly into the buffer.

• the start method params have fields level role and content. WE should be creating headers (#, ##, ###, etc) depending on the level. The title should be `ROLE {{role}} ({{content}}). Note that the content is shown in round brackets.

• the 'message' method just indicates that you should append either the content or the debug message into the buffer (debug only if debug mode is toggled on)

• the functions method always has json content and should append from a range. The content should be in a json fenced code block at all times.

• the functions-done is just sent to allow the function to be written one last time and add a new line.

• the error method has two params content and exception. I would suggest that we show only content for now. The content should be in a codeblock with a language of error.

content from error

This will allow us to highlight this codeblock with a red color to indiciate an error.

[ColinMcNeil]

Is the behavior in neovim when receiving debug to skip the message when debug is off? Making it a toggle would be tricky here.