Support color scheme reporting

CSI ? 996 n
CSI ? 2031 h
CSI ? 2031 l

Fixes #5626

src/common/services/CoreService.ts

@@ -17,6 +17,7 @@ const DEFAULT_DEC_PRIVATE_MODES: IDecPrivateModes = Object.freeze({
   applicationCursorKeys: false,
   applicationKeypad: false,
   bracketedPasteMode: false,
+  colorSchemeUpdates: false,
   cursorBlink: undefined,
   cursorStyle: undefined,
   origin: false,

src/common/services/Services.ts

@@ -313,6 +313,7 @@ export interface IVtExtensions {
   kittyKeyboard?: boolean;
   kittySgrBoldFaintControl?: boolean;
   win32InputMode?: boolean;
+  colorSchemeQuery?: boolean;
 }
 
 export const IOscLinkService = createDecorator<IOscLinkService>('OscLinkService');