Implements Balanced Bracket Pair Delete

[hediet]

This PR fixes #133663

Unfortunately, this code throws when deleting a bracket pair:

 ERR Cannot read property 'push' of undefined: TypeError: Cannot read property 'push' of undefined
    at vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:644:71
    at Function._computeCursorState (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/model/editStack.js:365:46)
    at EditStack.pushEditOperation (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/model/editStack.js:352:48)
    at TextModel._pushEditOperations (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/model/textModel.js:1041:41)
    at TextModel.pushEditOperations (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/model/textModel.js:963:29)
    at Function._innerExecuteCommands (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:634:45)
    at Function.executeCommands (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:601:33)
    at CursorsController._executeEditOperation (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:366:44)
    at vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:584:22
    at CursorsController._executeEdit (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:497:17)
    at CursorsController.executeCommands (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/controller/cursor.js:583:18)
    at vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/viewModel/viewModelImpl.js:814:69
    at ViewModel._withViewEventsCollector (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/viewModel/viewModelImpl.js:863:17)
    at ViewModel._executeCursorEdit (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/viewModel/viewModelImpl.js:785:18)
    at ViewModel.executeCommands (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/common/viewModel/viewModelImpl.js:814:18)
    at CodeEditorWidget.executeCommands (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/browser/widget/codeEditorWidget.js:822:39)
    at DeleteWordLeft.runEditorCommand (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/contrib/wordOperations/wordOperations.js:304:20)
    at vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/browser/editorExtensions.js:158:29
    at InstantiationService.invokeFunction (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/platform/instantiation/common/instantiationService.js:44:24)
    at CodeEditorWidget.invokeWithinContext (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/browser/widget/codeEditorWidget.js:206:47)
    at DeleteWordLeft.runCommand (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/browser/editorExtensions.js:152:27)
    at handler (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/editor/browser/editorExtensions.js:52:51)
    at InstantiationService.invokeFunction (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/platform/instantiation/common/instantiationService.js:44:24)
    at CommandService._tryExecuteCommand (vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/workbench/services/commands/common/commandService.js:74:59)
    at vscode-file://vscode-app/c:/dev/microsoft/vscode/out/vs/workbench/services/commands/common/commandService.js:64:47