[draft] TANF Section 4 validation enhancements

[ADPennington]

Description:
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Acceptance Criteria:
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• As tech lead, I need some space-filled values to be allowed in TANF Section 4 data files
• Outcome 2
• Outcome 3
• Testing Checklist has been run and all tests pass
• README is updated, if necessary

Tasks:
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• Task 1
• Task 2
• Task 3
• Run Testing Checklist and confirm all tests pass

Notes:
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• Note 1
• Note 2
• Note 3

Supporting Documentation:
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• Doc 1
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Open Questions:
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• Open Question 1
• Open Question 2

[ADPennington]

this can be closed because @jtimpe implemented this suggestion: #2657 (comment)