Start the units subpackage

[RobPasMue]

An important aspect of CAD libraries are the units. It is expected that, behind the scenes, all objects work in SI units, but users should be able to provide their values in different units. Let's get this module started!

• Implement the units module
• Create a `Quantity`` (enum) class handling the units accepted
• Create a Conversion class which will contain a Quantity (enum) value and a conversion factor
• Implement units inside the datamodel.objects package
• All units inside the objects must be stored in SI, but users will be able to provide different Quantity values. Conversions should be handled in construction and representation. Inside operations and operations between objects will always take place in SI
• Add testing (must be intensive, this is a critical module)
• Add documentation

See the following picture for having an idea of the location of the units subpackage

[RobPasMue]

This task is dependent on #1. Let's get that one ready first. I'll take care of this one afterwards

[jorgepiloto]

After @akaszynski suggested using pint, I think we could have a simple the following code in the root base __init__.py:

from pint import UnitRegistry

units = UnitRegistry()
"""Unit manager."""

This leads to the following user experience:

from ansys.geometry.core import units as u

length_A, length_B = 1.00 * u.m, 2.5 * u.inches
length_C = length_A + length_B
print(length_C)

>>> 1.0635 meter