[wip] API Refactoring

[marcofavorito]

Proposed changes

This PR aims to refactor some parts of the API to make it more flexible and generalizable to other abstractions.

Fixes

None.

Types of changes

What types of changes does your code introduce to agents-tac?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply.

• I have read the CONTRIBUTING doc
• I am making a pull request against the develop branch (left side). Also you should start your branch off our develop.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works

Further comments

It is a work in progress.

[marcofavorito]

This PR closes #70 thanks to pythomata.impl.symbolic.SymbolicAutomaton