Feature request: Allow configuring comments allowed in specific json files

[AndrewNolte]

I'd like to have config files similar to vscode's settings.json, because I'm developing a language server for multiple editors. Vscode allows its own configs to have comments, but I'm not able to do that for the lsp's config file.

I see two ways of adding this:

Currently the user could add this in their own settings.json- it would be nice if this could be contributed under "contributes" in package.json

"files.associations": {
  "myconfig.json": "jsonc"
}

Another option is an additional "allowComments" option next the jsonValidation

"jsonValidation": [
  {
    "fileMatch": [
      ".myconfig.json",
    ],
    "url": "./src/config.schema.json",
    "allowComments": true,
  }
],