Add option to specify columns to ignore for assert_df_equality

[kasztp]

Is your feature request related to a problem? Please describe.

Often when comparing dataframes we have some columns which can / should be ignored during the equality check. E.g. timestamp columns, or UUID.

Describe the solution you would like

Add a new optional parameter to assert_df_equality() function, where the user can specify the names of columns to ignore during comparsion.

Additional context

Technical solution could be either:

1. Dropping the specified columns from the dataframes before comparing them,
2. Extending all relevant comparsion functions to take this setting into account.

The first solution is doable with minimal code, and without affecting the rest of the functions.

Are you planning on creating a PR?

• [ x ] I'm planning to make a pull-request