InnoDB in MySQL 5.7 introduced two new parameters to the function
dict_hdr_get_new_id(), to allow redo logging to be disabled when
assigning identifiers to temporary tables or during the
backup-unfriendly TRUNCATE TABLE that was replaced in MariaDB
by MDEV-13564.

Now that MariaDB 10.4.0 removed the crash recovery code for the
backup-unfriendly TRUNCATE, we can revert dict_hdr_get_new_id()
to be used only for persistent data structures.

dict_table_assign_new_id(): Remove. This was a simple 2-line function
that was called from few places.

dict_table_open_on_id_low(): Declare in the only file where it
is called.

dict_sys_t::temp_id_hash: A separate lookup table for temporary tables.
Table names will be in the common dict_sys_t::table_hash.

dict_sys_t::get_temporary_table_id(): Assign a temporary table ID.

dict_sys_t::get_table(): Look up a persistent table.

dict_sys_t::get_temporary_table(): Look up a temporary table.

dict_sys_t::temp_table_id: The sequence of temporary table identifiers.
Starts from DICT_HDR_FIRST_ID, so that we can continue to simply compare
dict_table_t::id to a few constants for the persistent hard-coded
data dictionary tables.

undo_node_t::state: Distinguish temporary and persistent tables.

lock_check_dict_lock(), lock_get_table_id(): Assert that there cannot
be locks on temporary tables.

row_rec_to_index_entry_impl(): Assert that there cannot be metadata
records on temporary tables.

row_undo_ins_parse_undo_rec(): Distinguish temporary and persistent tables.
Move some assertions from the only caller. Return whether the table was
found.

row_undo_ins(): Add some assertions.

row_undo_mod_clust(), row_undo_mod(): Do not assign node->state.
Let row_undo() do that.

row_undo_mod_parse_undo_rec(): Distinguish temporary and persistent tables.
Move some assertions from the only caller. Return whether the table was
found.

row_undo_try_truncate(): Renamed and simplified from trx_roll_try_truncate().

row_undo_rec_get(): Replaces trx_roll_pop_top_rec_of_trx() and
trx_roll_pop_top_rec(). Fetch an undo log record, and assign undo->state
accordingly.

trx_undo_truncate_end(): Acquire the rseg->mutex only for the minimum
required duration, and release it between mini-transactions.