Adds autorest-based SQL Project generation to SQL Database Projects extension (#17078)

* Initial changes

* checkpoint

* Constructing project with post deployment script

* Correcting to intentionally read from cached list of projects

* Adding activation event, fixing fresh workspace bug

* Convert netcoreTool and autorestHelper to share a helper class for streamed command

* Include npm package version to force update

* test checkpoint

* Unit tests

* Added contextual quickpicks for autorest dialogs

* Adding projectController test

* Added projectController test, some refactoring for testability

* Merge branch 'main' into benjin/autorest

* Fixing 'which' import

* PR feedback

* Fixing tests

* Adding additional information for when project provider tests fail

* Hopefully fixing failing tests (unable to repro locally)

* Adding Generate Project item to workspace menu

* PR feedback

extensions/sql-database-projects/src/common/utils.ts

@@ -12,10 +12,11 @@ import * as glob from 'fast-glob';
 import * as dataworkspace from 'dataworkspace';
 import * as mssql from '../../../mssql';
 import * as vscodeMssql from 'vscode-mssql';
-import { promises as fs } from 'fs';
-import { Project } from '../models/project';
 import * as childProcess from 'child_process';
 import * as fse from 'fs-extra';
+import * as which from 'which';
+import { promises as fs } from 'fs';
+import { Project } from '../models/project';
 
 export interface ValidationResult {
 	errorMessage: string;
@@ -489,6 +490,23 @@ export async function retry<T>(
 	return undefined;
 }
 
+/**
+ * Detects whether the specified command-line command is available on the current machine
+ */
+export async function detectCommandInstallation(command: string): Promise<boolean> {
+	try {
+		const found = await which(command);
+
+		if (found) {
+			return true;
+		}
+	} catch (err) {
+		console.log(getErrorMessage(err));
+	}
+
+	return false;
+}
+
 /**
  * Gets all the projects of the specified extension in the folder
  * @param folder