* Major refactor of EditDataMetadata providers
* EditMetadataFactory generates "basic" EditTableMetadata objects based entirely on SMO metadata
* SmoEditTableMetadata no longer depends on SMO, making it unecessary to mock it
* Renamed SmoEditTableMetadata to EditTableMetadata
* EditTableMetadata can be extended with DbColumnWrappers
* Moving logic for extending a EditColumnMetadata into that class
* I *think* this will work for async execution of initialize tasks
* Fixing unit tests for new Edit(Table|Column)Metadata classes
* Async stuff that works! And passes unit tests
* Adding unit tests
Adding .idea to gitignore
* Adding message to the EditSessionReadyEvent
* Fixes from dev merge
* Fixing unit tests that Rider didn't catch as failing
May have been a bit heavy-handed with the async/await stuff
* Couple changes as per PR comments
