[HACKATHON] add expect_column_values_to_be_valid_us_state_or_territory_abbreviation

[Derekma73]

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Changes proposed in this pull request:

• added an expectation that all values in a column will be a valid us state or territory abbreviation

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[austiezr]

@Derekma73 thanks for your submission! Be sure to link this PR in your DevPost submission as well. 🚀