Update Prism Python bindings interface

Add GetProjects, GetProjectTemplates, GetGems, GetProject and GetGem.
CreateProject and UpdateProject and the engine functions are not implemented yet

Code/Tools/ProjectManager/Source/GemCatalog/GemInfo.cpp

@@ -22,4 +22,10 @@ namespace O3DE::ProjectManager
         , m_isAdded(isAdded)
     {
     }
+
+    bool GemInfo::IsValid() const
+    {
+        return !m_path.isEmpty() && !m_uuid.IsNull();
+    }
+
 } // namespace O3DE::ProjectManager