Add aim callback example

[nzw0301]

Motivation

aim is an open-sourced machine learning experiment tracking library. Thanks to aim community, aim provides an optuna callback, which is similar to Optuna's WeightsAndBiasesCallback, to record optuna optimisation into aim. It would be great to provide an example using aim callback in this repo.

Description

Add an example of aim. #55 might be a helpful example.

Alternatives (optional)

Additional context (optional)

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