odb: rename oid_object_info()

Rename `oid_object_info()` to `odb_read_object_info()` as well as their
`_extended()` variant to match other functions related to the object
database and our modern coding guidelines.

Introduce compatibility wrappers so that any in-flight topics will
continue to compile.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sequencer.c

@@ -5503,9 +5503,8 @@ int sequencer_pick_revisions(struct repository *r,
 
 		if (!repo_get_oid(r, name, &oid)) {
 			if (!lookup_commit_reference_gently(r, &oid, 1)) {
-				enum object_type type = oid_object_info(r,
-									&oid,
-									NULL);
+				enum object_type type = odb_read_object_info(r->objects,
+									     &oid, NULL);
 				res = error(_("%s: can't cherry-pick a %s"),
 					    name, type_name(type));
 				goto out;