Create a dedicated object that compares two grids

[rouille]

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• Is your feature request essential for your project?

Describe the workflow you want to enable

Now that we have grid objects whose number of attributes and the shape of the attributes can vary from one grid model to another or even among the same grid model (e.g. extra column in bus data frame for demand flexibility, etc), the simple overwriting of __eq__ is not enough anymore.

Describe your proposed implementation, if applicable

• Create a CompareGrid class living in a new powersimdata.input.compare_grid module
• The constructor takes two Grid objects
• Define multiple methods that compare individual portion of the Grid objects, e.g., compare_branch(). The function would have several parameters such as: columns that would define a list of columns to compare, tol that would define the tolerance on the comparison. Each methods would perform an assertion
• Remove the overwriting of __eq__ in powersimdata.input.grid

Additional context

Some tests would need to be refactored