Adding Derived Columns to ADS Flatfile Import (#16795)

* Adding derived column boilerplate

* brandan preliminary frontend changes

* empty commit

* added new param

* updating contracts, dialogue changes

* utils changes, saving timeout attempt

* pushing for aasim

* Cleaning up code and fixing the issue in theory

* changing button, did not solve independent scroll

* Fixing the scroll bar issue

* updating flat file service

* adding override keyword to overrriden method

* improving UI

* pushing changes associated with resolved comments

* localizing strings, editing comments

* all comments resolved

* Fixing a test

* updating import package
Updating azure MFA bug

* Clearing navigation validator
Fixing broken table name change

* fixed prose test

* removing unused code from tests

* Fixed PR comments

* Fixing some PR comments

* WIP

* Fixing transformation code and create derived column dialog styling

* removing unused code

* Adding comment for console log

* fixed table styling

* Adding some aria labels

* Fixed some code cleanup issues

* update import service

Co-authored-by: Aasim Khan <aasimkhan30@gmail.com>
Co-authored-by: bnhoule <t-bhoule@microsoft.com>

extensions/import/src/wizard/api/basePage.ts

@@ -91,7 +91,7 @@ export abstract class BasePage {
 		return values;
 	}
 
-	public async getDatabaseValues(): Promise<{ displayName: string, name: string }[]> {
+	public async getDatabaseValues(): Promise<azdata.CategoryValue[]> {
 		let idx = -1;
 		let count = -1;
 		let values = (await azdata.connection.listDatabases(this.model.server.connectionId)).map(db => {

extensions/import/src/wizard/api/models.ts

@@ -19,6 +19,8 @@ export interface ImportDataModel {
 	schema: string;
 	filePath: string;
 	fileType: string;
+	originalProseColumns: ColumnMetadata[];
+	newFileSelected: boolean;
 }
 
 /**