Fix warnings

[yemeen]

Closes #50

Description

removes parallel flag on compute_shape_descriptor since its just a simple function
and uses numba's list type to fix the deprecation warning on compile

For more information visit https://numba.readthedocs.io/en/stable/reference/deprecation.html#deprecation-of-reflection-for-list-and-set-types

File "src/ect/ect_graph.py", line 172:
    @njit(parallel=True, fastmath=True)
    def _compute_directional_transform(
    ^

  warnings.warn(NumbaPendingDeprecationWarning(msg, loc=loc))

Motivation and Context

aesthetic

How has this been tested?

ect.calculate(g) runs without warnings

Types of changes

• [ x] Bug fix (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

• [ x] My code follows the code style of this project. (make clean)
• [ x] I have incremented the version number in the pyproject.toml file.
• I have added tests to cover my changes.
• [ x] All new and existing tests passed. (make tests)