[HACKATHON] add expect_column_values_to_be_valid_ar_zip

[Derekma73]

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Changes proposed in this pull request:

• added an expectation that all values in a column will be a valid Arkansas zipcode

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[austiezr]

This is pulling zips for Arkansas (AR) but labeled throughout for Arizona, which has already been submitted.

[austiezr]

Hey @Derekma73 ! Sorry for the lack of clarity here; you've already submitted (now approved and merged) this expectation for Arizona. I think you may want to look at this submission & #4718 and resolve Alaska / Arkansas appropriately.

[Derekma73]

whoops! should be all good now

[austiezr]

LGTM, thanks @Derekma73 !