Shell completions for pgagroal

In the beginning of the current month I pushed a commit that introduces shell completions for pgagroal related commands, in particular pgagroal-cli (used to manage the pooler) and pgagroal-admin (used to manage authentication and users).
The shell completions work only for Bash and Zsh, and allow you to hit <TAB> after a command and get it automatically completed with the appropriate options.
While importing the completions in Bash is as simple as sourceing the file, in Zsh you need to enable the completion framework. Detailed instructions about how to enable the completions have been placed in the tutorials.