algorithms: Accept optional logbook instance

[leandrolanzieri]

Description

In many cases it may be useful to monitor the evolution process as it happens. As the complete algorithms provide no callback while running, a reasonable entry point is the logbook. The user can create a custom Logbook class that processes statistics as they are recorded (e.g., writing to a tensorboard writer).

This PR suggests that algorithms accept an optional logbook parameter that the user can instantiate. When not provided, the behaviour remains the same.

[fmder]

I like your PR, the only thing that I'm wondering is the signature change for those using only positional arguments.

[leandrolanzieri]

I like your PR, the only thing that I'm wondering is the signature change for those using only positional arguments.

Right. I'll move the logbook to the end so it doesn't affect those users.