* download Microsoft.Build.Sql sdk and extract
* cleanup extracted folder and nuget
* add constants
* cleanup
* remove package-lock.json
* making outputChannel required and some cleanup
* only download if the files aren't already there
* Add todo
* add try catches
* addressing comments
* initial build command execution
* adding tests
* Clean up test names
* update SqltoolsService release in ADS for Build
* Updating as per PR comments
* updating yarn lock
* Adding one more test for command run
* Test fixes