Upgrade SMO to 150 preview (#701)

* Switch to the unified SMO NuGet so all binaries are strong named and signed.

* use one AssemblyLoader instance for all loads

* Revert "use one AssemblyLoader instance for all loads"

This reverts commit 48c59ffd5c57152de281c87acdbcad7ddf7ab760.

* Stop creating multiple AssemblyLoadContext objects during composition, per https://github.com/dotnet/coreclr/issues/19632

* restore high entropyva property

* Improve the comment

* Update SMO to 150 and fix scripting for objects with a single quote in their name.

* restore newtonsoft reference

src/Microsoft.SqlTools.ServiceLayer/Scripting/ScriptingExtensionMethods.cs

@@ -103,10 +103,10 @@ namespace Microsoft.SqlTools.ServiceLayer.Scripting
             string urn = string.Format(
                 "Server[@Name='{0}']/Database[@Name='{1}']/{2}[@Name='{3}' {4}]",
                 server.ToUpper(),
-                database,
+                Urn.EscapeString(database),
                 scriptingObject.Type,
-                scriptingObject.Name,
-                scriptingObject.Schema != null ? string.Format("and @Schema = '{0}'", scriptingObject.Schema) : string.Empty);
+                Urn.EscapeString(scriptingObject.Name),
+                scriptingObject.Schema != null ? string.Format("and @Schema = '{0}'", Urn.EscapeString(scriptingObject.Schema)) : string.Empty);
 
             return new Urn(urn);
         }