* fix(typescript): add missing extension to imports in typescript
This is required for the types to work with the new
`--module-resolution=node16`.
The list of places to fix was obtained by a crude script:
```sh
rg -g'**/*.ts' -g'!**/*.test.ts' ' from\s+.\.' | rg -v '\.js'
```
References #1765
* add missing extensions
* revert tsconfig
* prettier
* fix test files for NodeNext
* prettier
* changelog entry
* prettier
* prettier
* prettier
---------
Co-authored-by: Andrey Lushnikov <aslushnikov@gmail.com>
* Rename SlSlideChange for consistency with other events
* Setup React event types for events used by Shoelace components
Means that consumers of Shoelace via the React wrapper will be able to
use callback methods with the correct event type, instead of having to
rely on casting and friends when using Typescript.
* Add docs demonstrating importing event types for React callbacks