Add SQL-accessible functions for inspecting index AM properties.

Per discussion, we should provide such functions to replace the lost
ability to discover AM properties by inspecting pg_am (cf commit
65c5fcd35).  The added functionality is also meant to displace any code
that was looking directly at pg_index.indoption, since we'd rather not
believe that the bit meanings in that field are part of any client API
contract.

As future-proofing, define the SQL API to not assume that properties that
are currently AM-wide or index-wide will remain so unless they logically
must be; instead, expose them only when inquiring about a specific index
or even specific index column.  Also provide the ability for an index
AM to override the behavior.

In passing, document pg_am.amtype, overlooked in commit 473b93287.

Andrew Gierth, with kibitzing by me and others

Discussion: <87mvl5on7n.fsf@news-spur.riddles.org.uk>

src/backend/access/gin/ginutil.c

@@ -57,6 +57,7 @@ ginhandler(PG_FUNCTION_ARGS)
 	amroutine->amcanreturn = NULL;
 	amroutine->amcostestimate = gincostestimate;
 	amroutine->amoptions = ginoptions;
+	amroutine->amproperty = NULL;
 	amroutine->amvalidate = ginvalidate;
 	amroutine->ambeginscan = ginbeginscan;
 	amroutine->amrescan = ginrescan;