* WIP -Getting Started Registry

* Initial idea of how registry/service will work

* Getting started with Getting Started

* Add telemetry and touch up enablement flag

* Add contrib as startup editor

* Move to allowing static Getting Start blob

* No newline

* Remove unused enum

Things done:
- set pinned more explicitly in many places
- flip the default of enablePreviewFromQuickOpen to false
- change lists/tree to pin if preserveFocus: false after opening

For #103454

This should be a direct map to the `.findIndex` mathod

This gets us ready for TS 4.1

* Add SyncActionDescriptor.from

There are a whole lot of places in our code where have the following pattern:

```
actionRegistry.registerWorkbenchAction(SyncActionDescriptor.create(CreateNewLocalTerminalAction, CreateNewLocalTerminalAction.ID, CreateNewLocalTerminalAction.LABEL));
```

Notice how the class name has to be repeated  three times.

This change introduces a helper function `SyncActionDescriptor.from` that lets you instead just pass in the class:

```js
actionRegistry.registerWorkbenchAction(SyncActionDescriptor.create(CreateNewLocalTerminalAction));
```

* Avoid cast

Add override information to inspect

* wip 2

* use viewlet stubs

* fix layering issue

* fix saveState and contextmenus

* move context menu logic into panecomposite

* revert tasks.json

* tasks again

* add showHeaderInTitleWhenSingleView values

* patch tests

* some cleanup

* more cleanup

* start view

* merging conflicts

* fix title and dnd

* adding missing api surface to pane composite

* additional merge resolution

For #81574

See #84669 for details of the problem around strict function types. This change converts `SyncActionDescriptor` to use a static `create` function. This allows us to make the `create` function generic so that it can take the correct types for strictFunctionTypes

Readonly helps out with TS's type guards and is also a good best practice. Specifically, readonly strings/numbers have their literal type instead of a generic `string` | `number` type, which can help catch dead code and some common programming mistakes

separate schema for workbenchColors and textmateColors, to avoid repetition in configuration schemas