Add support for adding dacpac references in sql database projects (#10684)

* add dacpacs

* able to add reference to appropriate master dacpac

* able to add reference to a dacpac

* Add a few tests

* fix tests

* fix wording

* fix adding reference to same database

* add project tests

* fix test for windows

* addressing comments

* Adding another test

* update tests

* fix build error

extensions/sql-database-projects/package.json

@@ -113,6 +113,11 @@
         "command": "sqlDatabaseProjects.importDatabase",
         "title": "%sqlDatabaseProjects.importDatabase%",
         "category": "%sqlDatabaseProjects.displayName%"
+      },
+      {
+        "command": "sqlDatabaseProjects.addDatabaseReference",
+        "title": "%sqlDatabaseProjects.addDatabaseReference%",
+        "category": "%sqlDatabaseProjects.displayName%"
       }
     ],
     "menus": {
@@ -226,6 +231,11 @@
           "when": "view == sqlDatabaseProjectsView",
           "group": "3_dbProjects_newItem@9"
         },
+        {
+          "command": "sqlDatabaseProjects.addDatabaseReference",
+          "when": "view == sqlDatabaseProjectsView",
+          "group": "4_dbProjects_addDatabaseReference"
+        },
         {
           "command": "sqlDatabaseProjects.close",
           "when": "view == sqlDatabaseProjectsView",