New extension support for PL/SQL language (#2735)

* Add additional PL/SQL file extensions

* Add PL/SQL samples for .ddl and .prc

* Fix sort order of PL/SQL extensions

* Restore vendor/grammars/assembly.

* Restore `pls` as primary PL/SQL extension

* Add tpb to go with tps

lib/linguist/languages.yml

@@ -3049,12 +3049,21 @@ PLSQL:
   color: "#dad8d8"
   extensions:
   - ".pls"
+  - ".bdy"
+  - ".ddl"
+  - ".fnc"
   - ".pck"
   - ".pkb"
   - ".pks"
   - ".plb"
   - ".plsql"
+  - ".prc"
+  - ".spc"
   - ".sql"
+  - ".tpb"
+  - ".tps"
+  - ".trg"
+  - ".vw"
   language_id: 273
 PLpgSQL:
   type: programming