MDEV-24813 [poc] Signal full table lock when cond is NULL

[mariadb-YuchenPei]

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This is an initial patch for discussion.

Will work in the following minimal example

--source include/have_innodb.inc CREATE TABLE t (a INT PRIMARY KEY) ENGINE=InnoDB; insert into t values (42);

BEGIN; SELECT * FROM t LOCK IN SHARE MODE; # will acquire S lock COMMIT;

DROP TABLE t;