Remove duplicate calls to URI.toString()

Add API to force quit with the ability to revert changes silently

File does not reload in editor when quickly changed externally after making modifications (fixes #12077)

* Prototype of Implementations Code Lens Provider for TypeScript

Adds a prototype code lens that shows the number of implementations for interfaces and abstract classes. This shares a lot of code with the references code lens provider, so I extracted most of the common stuff into a base class.

* Support children of interfaces

* Add setting to control implementations code lens

**Bug**
Some regression since 1.9 caused the scroll preserve behavior of webviews to stop working in certain cases. There appears to be a race condition where `newFrame.contentDocument.body` does not exist when the scroll update code is called

**Fix**
Instead of using a timeout, update the scroll position when `DOMContentLoaded` is fired from the webview window

Fixes #21491

-  id is pub.name. name in lower case.
- use id to match sync installed extension with gallery extension
- use id to identify extension while installing and uninstalling
- Clean up
- Remove IExtensionIdentity
- Add util methods to create gallery id and local extension id

fixes #21149

fixes #21369

fixes #21082
fixes #21329