Add function to export profiles

[jenhagg]

Purpose

Address #482

What the code is doing

Define export_scaled_profile function which can be called given a profile kind/version, grid, change table, and destination path. We now call this function from SimulationInput.prepare_profile, but it could be called independent of a scenario.

Testing

Prepared a scenario in a container with a change table and it worked as expected.

Time estimate

10 min

[BainanXia]

Looks good. Thanks for the clean up, object is no longer needed with Python 3.0+

[danielolsen]

Clean implementation, thanks.

[rouille]

Kind of wondering, if it would make sense to have an export_data module in powersimdata.input that will gather the function @jon-hagg just implemented and the export_case_mat function.

[BainanXia]

Kind of wondering, if it would make sense to have an export_data module in powersimdata.input that will gather the function @jon-hagg just implemented and the export_case_mat function.

That would definitely be more explicit from the user's perspective.