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

samples/PLSQL/videodb.ddl

@@ -0,0 +1,48 @@
+CREATE TABLE users (
+   user_name varchar2(40),
+   first_name varchar2(40),
+   last_name varchar2(40),
+   email varchar2(40),
+   password varchar2(40),
+   created_date DATE,
+   total_credits NUMBER,
+   credit_change_date DATE,
+   PRIMARY KEY (user_name)
+);
+/
+
+CREATE TABLE users_videos (
+   video_id NUMBER,
+   video_name varchar2(40),
+   user_name varchar2(40),
+   description varchar2(512),
+   upload_date DATE,
+   PRIMARY KEY (video_id),
+   CONSTRAINT "USERS_VIDEOS_FK1" FOREIGN KEY ("USER_NAME") REFERENCES "USERS"("USER_NAME")
+);
+/
+
+create or replace procedure print_user_videos(
+    p_user_name in users.user_name%type
+)
+AUTHID DEFINER
+as
+    type t_user_videos is table of users_videos%rowtype
+        index by pls_integer;
+    l_videos t_user_videos;
+begin
+
+    select *
+    bulk collect into l_videos
+    from users_videos
+    where user_name = p_user_name;
+
+    for i in 1..l_videos.COUNT
+    loop
+
+        dbms_output.put_line(l_videos(i).video_name);
+
+    end loop;
+
+end print_user_videos;
+/