Dynamic columns C functions should be included in libmysqlclient

Hi folks,

As title stated. I strongly suggest it. Dynamic columns is a great feature and should be in future more adopted by developers. As one of them, I while miss required C functions to manipulate the "BLOB" easily in the client side. The common manipulation using SQL may be very inefficient on complex applications with dozens of columns. Is more elegant provide a API.

Actually as the documentation noted (https://kb.askmonty.org/en/dynamic-columns/) the dynamic columns functions already is included in libmysqld.

But these functions should be equally important on both libmysqlclient and libmysqld.

Not all linux distributions include the libmysqld on mysql package by default. Also link the application with both libmysqld and libmysqlclient is at least a bad practice.

Best regards