[FEATURE] Ability to Define Language-Specific Settings (beyond `syntaxIgnore`)

[LangLangBart]

Currently, the extension supports trailing-spaces.syntaxIgnore to ignore specific languages, but there is no way to define language-specific settings, other than ignoring all other languages.

  "trailing-spaces.syntaxIgnore": [
    "bat",
    "c",
    "clojure",
    "coffeescript",
    "cpp",
    ...

For example, it would be useful to define settings specifically for markdown like this:

{
  "[markdown]": {
    "trailing-spaces.includeEmptyLines": true,
    "trailing-spaces.regexp": "^[\\s]+",
    "trailing-spaces.trimOnSave": true
  }
}

Currently unsupported:

Thank you!