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In the temporary file that is applied by row_log_table_apply(),
we must identify whether the records contain the extra header for
instantly added columns. For now, we will allocate an additional byte
for this for ROW_T_INSERT and ROW_T_UPDATE records when the source table
has been subject to instant ADD COLUMN. The ROW_T_DELETE records are
fine, as they will be converted and will only contain 'core' columns
(PRIMARY KEY and some system columns) that are converted from dtuple_t.

rec_get_converted_size_temp(), rec_init_offsets_temp(),
rec_convert_dtuple_to_temp(): Add the parameter 'status'.

rec_set_n_add_field(): Simplify the interface to resemble
rec_get_n_add_field().

rec_init_offsets_comp_ordinary(): Handle the new rec_leaf_format
constant REC_LEAF_TEMP_COLUMNS_ADDED.

rec_get_converted_size_comp_prefix_low(),
rec_convert_dtuple_to_rec_comp(): Handle
index->is_instant() for both temp and !temp.