Load and initialize CinderX for Python 3.12

Summary:
Loads and initializes the CinderX module as part of Lib/site.py.  If the module
can't be found, such as when CinderX isn't bundled with the installation, then
silently nothing happens.

Failures that bubble up to the top-level CinderX module are no longer
suppressed.  The suppression that does need to be added is to the _static
module, as that's not initializing successfully right now.

I have no idea if this is what we had in mind for initializing CinderX for 3.12.
I believe our plan was to make it more explicit and only load when users added
the extension as a dependency to their TARGETS rules.  But in the meantime this
helps us run tests.

Reviewed By: jbower-fb

Differential Revision: D60384976

fbshipit-source-id: fe28752e967d7562012031540188279d044d66a3

Lib/site.py

@@ -600,6 +600,18 @@ def execusercustomize():
                 (err.__class__.__name__, err))
 
 
+def init_cinder():
+    import importlib.util
+    if importlib.util.find_spec("cinderx") is None:
+        return
+    try:
+        import cinderx
+
+        cinderx.init()
+    except Exception as e:
+        raise RuntimeError("Failed to initialize CinderX module") from e
+
+
 def main():
     """Add standard site-specific directories to the module search path.
 
@@ -625,6 +637,7 @@ def main():
     sethelper()
     if not sys.flags.isolated:
         enablerlcompleter()
+    init_cinder()
     execsitecustomize()
     if ENABLE_USER_SITE:
         execusercustomize()