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/config.json

@@ -1,7 +1,7 @@
 {
 	"downloadUrl": "https://sqlopsextensions.blob.core.windows.net/extensions/import/service/{#version#}/{#fileName#}",
 	"useDefaultLinuxRuntime": true,
-	"version": "0.0.8",
+	"version": "0.0.9",
 	"downloadFileNames": {
 		"Windows_64": "win-x64.zip",
 		"Windows_86": "win-x86.zip",