sync files with language server

[justinmann]

• Created a custom FileSystemProvider to capture file changed
• Send file change/delete via new websocket message on the existing channel
• Use a /tmp folder path so the server can safely persist the files to disk
• Use file update time to make sure out-of-order websocket message does not overwrite a valid version
• Add getWorkingCopyServiceOverride so it autoSave setting would work
• defaultHtmlAugmentationInstructions was adding a div with no class that was screwing up the layout which is why your CSS needed to use "95vh". This approach makes it scales to 100% of parent which is much easier to use that viewport fixed percentage.
• Sends a "pipInstall" command that create a venv on the servers and installs from requirements.txt

TODO:

• The custom websocket message needs to be filtered out and not forwarded to Pyright not sure how to do this
• Debugger needs work, I had to disable it because it seems to have its file syncing but one-time
• If you add a new file, then pyright does not detect it and will fail to import. I tried to add --verbose to pyright to debug this, but I cannot see any output. "createServerProcess" seems to be messing around with stdout, so I have no idea where the logs for pyright are going.
• Get imports from external libraries to work, according to the import resolution for PyRight it seems to assume a single project is running. I have no idea how to convince it use the venv for each active workspace.
  https://github.com/microsoft/pyright/blob/main/docs/import-resolution.md