Fixes #66944: Tokenize viewport with debouncing after scrolling and when the tokenization support has changed

- File workspaces: Use node services until file service is acquired
- Non file workspaces:  Use cached workspace until file service is acquired

Update README.md

fixes #66747

fixes #66792

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