Add formatter settings on workspace initialization

[khaosdoctor]

Describe the bug

This is both a bug and a feature request (which I'm willing to implement if needed in #790), but when setting up the workspace, deno.fmt is enabled, but even with all the extensions disabled and just deno enabled, it doesn't seem to correctly set the default formatter to denoland.vscode_deno by default.

To Reproduce

To get a better reproducibility disable all your extensions by cmd+shif+p -> Disable all installed extensions:

Then enable only the deno extension on the extension manager.

1. Set up a new directory anyywhere
2. Initialize deno workspace, answer yes to all questions
3. There should be a .vscode/settings.json file with these contents:

{
  "deno.enable": true,
  "deno.unstable": true,
}

4. Create a *.ts file anywhere, type any full TS command with a different formatting then Deno expects, like:

import { resolve } from 'https://deno.land/std/path/mod.ts'
// 						/\ single quotes				  /\ missing ;

5. Save the file, if you haven't configured editor.formatOnSave option, this shouldn't do anything by default, however if you do cmd+shift+p -> format document, is also doesn't do anything.

Expected behavior

It should apply deno.fmt on the file and the line should look like:

import { resolve } from "https://deno.land/std/path/mod.ts";
//					    /\ double			 			   /\ correct ;

Screenshots

This is a gif of the current behaviour:

I figured out that, if you set "[typescript]": { "editor.defaultFormatter": "denoland.vscode_deno" } in the settings, this would work, like so:

Versions

vscode: 1.74.3 deno: 1.29.2 extension: v3.16.0

Proposed solution

Include, by default, these lines in the settings when setting up the workspace:

{
  "[typescript]": {
    "editor.defaultFormatter": "denoland.vscode-deno"
  },
  "[typescriptreact]": {
    "editor.defaultFormatter": "denoland.vscode-deno"
  }
}

Also would be a nice addition to ask if the user wants to format on save and then include editor.formatOnSave as true as I see there's #328 about it too.