MDEV-4911 - add KILL query id, and add query id information to processlist

It is now possible to kill query by query id. KILL syntax was extended to:
KILL [HARD | SOFT] [CONNECTION | QUERY [ID query_id]] [thread_id | USER user_name]

Added QUERY_ID column to INFORMATION_SCHEMA.PROCESSLIST.

Fixed tests affected by this change:
- added PROCESSLIST.QUERY_ID column
- ID is now keyword and is quoted in SHOW CREATE TABLE output
- PFS statement digest is calculated basing on token id
  (not token text). Token id has shifted for keywords residing
  after ID in keywords array.

mysql-test/t/sp_notembedded.test

@@ -63,10 +63,10 @@ drop procedure if exists bug6807|
 --enable_warnings
 create procedure bug6807()
 begin
-  declare id int;
+  declare a int;
 
-  set id = connection_id();
-  kill query id;
+  set a = connection_id();
+  kill query a;
   select 'Not reached';
 end|