Add support in Python API for the recommended max working set size. (#128289)

Adds ways for users to request recommended max size for Metal on Mac. It plumbs through
https://developer.apple.com/documentation/metal/mtldevice/2369280-recommendedmaxworkingsetsize?language=objc

Can be used like
```
        max_memory = torch.mps.recommended_max_memory()
        print ("Recommended Max Memory : ", (max_memory/(1024*1024*1024)), "GB")
```

Co-authored-by: Nikita Shulga <2453524+malfet@users.noreply.github.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/128289
Approved by: https://github.com/malfet

test/test_mps.py

diff --git a/test/test_mps.py b/test/test_mps.py
index 00fc5c0..c59a598 100644
--- a/test/test_mps.py
+++ b/test/test_mps.py
@@ -7893,6 +7893,11 @@
         self.assertTrue(current_alloc_after > current_alloc_before)
         self.assertTrue(driver_alloc_after > driver_alloc_before)
 
+    def test_mps_allocator_stats(self):
+        max_memory = torch.mps.recommended_max_memory()
+        print(f"Recommended Max Memory : {max_memory/ 1024 ** 3} GB")
+        self.assertTrue(max_memory > 0)
+
     # to verify this test, run XCode Instruments "Metal System Trace" or "Logging" tool,
     # press record, then run this python test, and press stop. Next expand
     # the os_signposts->PyTorchMPS and check if events or intervals are logged