Finalizer.Instance.Collect() and Runtime.TryCollectingGarbage(...) are now callable from Python

Author: lostmsu

src/runtime/Finalizer.cs

@@ -106,6 +106,7 @@ internal IncorrectRefCountException(IntPtr ptr)
 
         #endregion
 
+        [ForbidPythonThreads]
         public void Collect() => this.DisposeAll();
 
         internal void ThrottledCollect()

src/runtime/Runtime.cs

@@ -362,6 +362,7 @@ static bool TryCollectingGarbage(int runs, bool forceBreakLoops)
         /// </summary>
         /// <param name="runs">Total number of GC loops to run</param>
         /// <returns><c>true</c> if a steady state was reached upon the requested number of tries (e.g. on the last try no objects were collected).</returns>
+        [ForbidPythonThreads]
         public static bool TryCollectingGarbage(int runs)
             => TryCollectingGarbage(runs, forceBreakLoops: false);