Expose f_smgr to extensions for manual implementation

There are various reasons why one would want to create their own
implementation of a storage manager, among which are block-level compression,
encryption and offloading to cold storage. This patch is a first patch that
allows extensions to register their own SMgr.

Note, however, that this SMgr is not yet used - only the first SMgr to register
is used, and this is currently the md.c smgr. Future commits will include
facilities to select an SMgr for each tablespace.

Author: MMeent

src/backend/postmaster/postmaster.c

@@ -915,6 +915,11 @@ PostmasterMain(int argc, char *argv[])
 	 */
 	ApplyLauncherRegister();
 
+	/*
+	 * Register built-in managers that are not part of static arrays
+	 */
+	register_builtin_dynamic_managers();
+
 	/*
 	 * process any libraries that should be preloaded at postmaster start
 	 */