Add akv token request logic (#9556)

Add support for running queries that require a decryption key from Azure Key Vault when using Always Encrypted.

src/sql/azdata.proposed.d.ts

@@ -129,7 +129,8 @@ declare module 'azdata' {
 	 * Add OssRdbms for sqlops AzureResource.
 	 */
 	export enum AzureResource {
-		OssRdbms = 2
+		OssRdbms = 2,
+		AzureKeyVault = 3
 	}
 
 	export interface ModelBuilder {

src/sql/platform/accounts/common/interfaces.ts

@@ -45,7 +45,8 @@ export interface IAccountManagementService {
 export enum AzureResource {
 	ResourceManagement = 0,
 	Sql = 1,
-	OssRdbms = 2
+	OssRdbms = 2,
+	AzureKeyVault = 3
 }
 
 export interface IAccountStore {

src/sql/workbench/api/common/sqlExtHostTypes.ts

@@ -394,7 +394,8 @@ export class TreeComponentItem extends vsExtTypes.TreeItem {
 export enum AzureResource {
 	ResourceManagement = 0,
 	Sql = 1,
-	OssRdbms = 2
+	OssRdbms = 2,
+	AzureKeyVault = 3
 }
 
 export class TreeItem extends vsExtTypes.TreeItem {