[Feature Request] Allow defining the step between values on increasing/decreasing tests

[vitorbaptista]

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

I have a column that must be strictly increasing, but the values need to have a difference of exactly 1 between them. So values like 1, 2, 3 are valid, but 1, 3, 4 are not.

Describe the solution you'd like

It would be great if expect_column_values_to_be_increasing accepted an optional step parameter. If this is set, then it requires increasing values with this specific step. Otherwise, the test continue working as now.

Describe alternatives you've considered

I couldn't find a test that would work like this.

Additional context

How would this step work with non-numeric columns?