[Feature] Add icons for vscode settings & settings(JSON)

[nick22985]

• [ ] Setting to enable/disable
• [ ] Add required schemes to ALLOWED_SCHEME
• [ ] add support to detect schema that it is in e.document.uri.scheme if it is one that is a vscode setting make it refer to those icons scheme in the default icon file. Ideally it will set it as the extension so no other config option have to be added (treat the scheme as a language).
• [ ] add definitions in languages.json
• [ ] Add / Create icons that match theme