* [enhancement](load) shrink reserved buffer for page builder (#14012) For table with hundreds of text type columns, flushing its memtable may cost huge memory. These memory are consumed when initializing page builder, as it reserves 1MB for each column. So memory consumption grows in proportion with column number. Shrinking the reservation may reduce memory substantially in load process. Signed-off-by: freemandealer <freeman.zhang1992@gmail.com> * response to the review Signed-off-by: freemandealer <freeman.zhang1992@gmail.com> * Update binary_plain_page.h * Update binary_dict_page.cpp * Update binary_plain_page.h Signed-off-by: freemandealer <freeman.zhang1992@gmail.com>