Move banquise repositories to MariaDB's github

Create the banquise-server repository to host the code. The repo should
be in MariaDB's GitHub.
This is the server part of the new plugin manager for the m-ecosystem.

Create the mariabd-plugin-banquise repository (previously known as
banquise_lite) in MariaDB's GitHub

Create the mysql-component-banquise repository in MariaDB's GitHub

Create the mariadb-plugin-banquise-agent repository in MariaDB's GitHub.