Support protocol packages larger than 16 MiB

[clue]

Currently, the protocol parser only supports protocol packets up to 2^24-1 bytes (16 MiB - 1 byte). For example, this means that all columns in a single row can not be bigger than 16 MiB. Having a larger number of rows with smaller rows each is already supported.

Implementation details can be found on https://mariadb.com/kb/en/library/0-packet/#packet-splitting.