Fix for MDEV-6493: Assertion `table->file->stats.records > 0 || error' failure, or 'Invalid write' valgrind warnings, or crash on scenario with Aria table, view, LOCK TABLES

This bug only happens in case of paritioned tables used in LOCK TABLES and implicit_commit() was called
(as part of trying to execute a CREATE TABLE withing lock tables)

The problem was that Aria could not move the tables from one transaction to the new one, as thd->open_tables contained
a partitioned tables and not an Aria table.

Fix:
- Store a list of all open tables that are part of a share in share->open_tables
- In maria::implict_commit() use transaction->used_tables & share->open_tables to find out which tables
  was part of the current transaction instead of using thd->open_tables, which may contain partitioned tables.


mysql-test/suite/maria/maria_partition.result:
  Added test case
mysql-test/suite/maria/maria_partition.test:
  Added test case
storage/maria/ha_maria.cc:
  Use trn->used tables and share->open_tables to find out which tables was part of the current transaction instead of using thd->open_tables.
storage/maria/ma_close.c:
  Remove closed table from share->open_list
storage/maria/ma_open.c:
  Add table to share->open_list
storage/maria/ma_state.c:
  Added comment
storage/maria/maria_def.h:
  Added share->open_list, a list of all tables that is using this share.