Add "relative path annotations" to schemas

Description of the feature / enhancement.

In general, popular language servers have a nifty file-renaming feature. If a file is renamed, any corresponding imports in other files are changed to match. This is currently not possible with arbitrary JSON,YAML,TOML files (with a Schema). Consider the following package.json:

{
  "bin": "./bin/somefile.js"
}

The idea is to add an annotation to these types of files:

{
  "bin": {
    "type": "string",
    "x-metadata": {
      "isRelativeFilePath": true
    }
  }
}

That way, any LSPs have the required information to potentially perform a rename.