Remove SELECT * from edit/initialize Query (#288)

* 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

.gitignore

@@ -58,6 +58,9 @@ cross/rootfs/
 [Bb]uild[Ll]og.*
 test*json
 
+## Project Rider ##
+.idea/
+
 #NUNIT
 *.VisualState.xml
 TestResult.xml
@@ -169,9 +172,6 @@ publish/
 *.nupkg
 **/packages/*
 
-# NuGet package restore lockfiles
-project.lock.json
-
 # Windows Azure Build Output
 csx/
 *.build.csdef
@@ -243,8 +243,6 @@ $RECYCLE.BIN/
 
 ### Linux ###
 
-*~
-
 # KDE directory preferences
 .directory