Microsoft Cognitive Services Speech SDK Samples

Add web hooks to custom speech sample (#705)

* Update c# sample to use v3 API.

* Remove unnecessary usings

* Improved readability
Fixed comment

* - proper paginating through transcriptions.
- add section in to reference from azure docs.

* Fixed code after testing it

* - switched to new project format
- using package references
- updated to .net 4.7.2
- fixed comments
- sorted usings
- moved usings into namespace declaration consistently

* Fixed grammar issue in comment

* Added webhook client and example and webhook receiver

* Fix compile issue
Added / update readmes

* Show invocationid too

* Make Main oldschool again

* Removed duplicated files
Fixed readme
Moved files to correct location
Added comments in code

Co-authored-by: BrianMouncer <48774897+BrianMouncer@users.noreply.github.com>