Make it a Python project with `pyproject.toml` and enable callable creation within the installed package

We want to be able to install `AMMap` and then use a script or notebook to define callable we will use later (after reloading the package) like:
```python
from ammap.callables.projectA import equilibriumPhaseLabels, scheilMassFractions, dParam
```
or perhaps
```python
from ammap.callables.AlFeNiRu import equilibriumPhaseLabels, scheilMassFractions, dParam
```