* update the default Microsoft.Build.Sql version used by sql projects
* update Microsoft.Build.Sql SDK version
* update baselines and template to also use 0.1.7-preview
* 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
* allow relative paths in project file outside of project folder
* Adding some tests
* Adding error string to loc strings
* Fixed test
* fix error message
* PR comments and some more fixes
* 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