Implement UnitConverter class

[chrischang5]

Description

• Resolves Create unit conversion class #7

• Created UnitConverter class, __init__ and convert functions
• Created ScalarOrArray type

Verification

• Added tests in tests/unit/common/test_unit_conversions.py

Resources

• https://www.calculatorsoup.com/calculators/conversions/acceleration.php
• https://www.unitconverters.net/weight-and-mass-converter.html
• Google Unit Converter

[chrischang5]

I really spelled UnitConvertor in my commit messages LOL my bad.

[chrischang5]

One step that could potentially be done to make a more complete test coverage is to parameterize tests for all unit conversions. Currently, only the angle to radians and radians to angle tests are parameterized in this way.

[DFriend01]

Looks great! There was one more thing that I wanted to check, and that was to see if the unit converter works with array-like objects as well as scalars.

Looking at the code, it probably should. Could you do the following:

• Add some tests to see if passing in ND arrays works where the conversion happens elementwise
• Change the typing from Scalar to ArrayLike for both the UnitConverter and the ConversionFactor class as appropriate? Take a look at the ArrayLike type. It covers both scalars and arrays in a single type.

[DFriend01]

Good work. Just one small comment but I'm approving now. Once you make the change, feel free to merge this PR.