.sqlproj and datasources.json file parsing (#8921)

* Checkpoint

* Adding mock contents for tree

* added open sqlproj dialog

* reading files from directory

* Added directory traversal

* Adding tree sorting by folder vs file and label

* Improved auto-unfolding of tree based on node type

* replacing fs with fs.promise alias

* PR feedback

* added activation event for when workspace contains sqlproj files

* Returning after displaying error

* Fixing linter errors

* Reworked tree

* Fixing missing grandchildren

* Correcting tree URI construction

* Refactoring to isolate tree item responsibilities from data model responsibilities

* project file parsing

* constructing tree from project files rather than filesystem

* Fixing double-initialization

* Changing projectEntry to take enum for file type

* Correct node type for project item

* Parsing datasources.json

* Child nodes for sql data source

* Localizing strings

* Checkpoint

* Adding mock contents for tree

* added open sqlproj dialog

* reading files from directory

* Added directory traversal

* Adding tree sorting by folder vs file and label

* Improved auto-unfolding of tree based on node type

* replacing fs with fs.promise alias

* PR feedback

* added activation event for when workspace contains sqlproj files

* Returning after displaying error

* Fixing linter errors

* Reworked tree

* Fixing missing grandchildren

* Correcting tree URI construction

* Refactoring to isolate tree item responsibilities from data model responsibilities

* project file parsing

* constructing tree from project files rather than filesystem

* Fixing double-initialization

* Changing projectEntry to take enum for file type

* Correct node type for project item

* Parsing datasources.json

* Child nodes for sql data source

* Localizing strings

* missed file in merge

* changed extension method to helper

* cleanup

* Adding docstrings

extensions/sql-database-projects/package.json

@@ -39,14 +39,14 @@
       }
     ],
     "menus": {
-        "commandPalette": [
-          {
-            "command": "sqlDatabaseProjects.new"
-          },
-          {
-            "command": "sqlDatabaseProjects.open"
-          }
-        ]
+      "commandPalette": [
+        {
+          "command": "sqlDatabaseProjects.new"
+        },
+        {
+          "command": "sqlDatabaseProjects.open"
+        }
+      ]
     },
     "views": {
       "explorer": [
@@ -59,9 +59,11 @@
     }
   },
   "dependencies": {
-    "vscode-nls": "^3.2.1"
+    "vscode-nls": "^3.2.1",
+    "xml2js": "^0.4.23"
   },
   "devDependencies": {
+    "@types/xml2js": "^0.4.5",
     "tslint": "^5.8.0",
     "typescript": "^2.6.1"
   }