Kusto Notebook Kernel Changes (#11760)

* Able to get Kernel Alias using extension registery

* Get Kernel Alias through Capability Services

* Notebook Action feature to add kusto to dropdown based on extension - complete

* Fixed indexing issue when Kusto is in kernels Dropdown

* Kusto Kernel listed properly and selected when kernel changes

* Added kernel change when user Attaches To Kusto connection

* Deleted unnecessary code/refactored

* Fix Merge Issues

* Resolving Compile issues - test file error

* Capabilities Provider Changes

* Fixed Notebook Tests

* Rearchitect kernel changes to Notebook Model

* Address minor changes

src/sql/azdata.proposed.d.ts

@@ -40,6 +40,10 @@ declare module 'azdata' {
 		export interface IStandardKernel {
 			readonly blockedOnSAW?: boolean;
 		}
+
+		export interface IKernelChangedArgs {
+			nbKernelAlias?: string
+		}
 	}
 
 	export type SqlDbType = 'BigInt' | 'Binary' | 'Bit' | 'Char' | 'DateTime' | 'Decimal'