Fixes #66881

Add strict null checks to suggestMemory.test.ts

Prototype autoFix source code action

Apply auto fix on save actions sequentially and make sure we request fixes of the specific type we are interested in

We likely do not want to enable autofixes until we have proper TS support: https://github.com/Microsoft/TypeScript/issues/29452

Part of #62110

* Adds a new `CodeActionKind`: `source.autoFix`.
* Implements a simple auto fix provider for typescript. This provider can auto fix `implement interface` and `spelling` errors (provided there is only a single valid fix listed)

The provider is likely not something we actually want to check it (especially in its current state), we should ask TS for proper autoFix support

For https://github.com/Microsoft/typescript-tslint-plugin/issues/49

Fixes #66870

Fixes #66772

#66702

Experimentally mark preferred code actions with a star while we come up with better UX for this

Part of #62110

Use the more generic name as suggested in https://github.com/Dart-Code/Dart-Code/issues/1393. This makes the intent of the field more clear and also allows us to extend the concept of preferred code actions to refactorings and other classes of code actions

Experimentally also allows a `preferred` value for `apply` when configuring code aciton keyboard shortcuts. This applies the preferred code action returned from the list of code actions returned

refactor terminalInstance.ts

[themes] Add ability to reload themes without restarting the editor

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