* configure max chars for textbox
* min 1
* Adds server-side check for text box min and max character validation.
* Applied suggestion from code review.
* Bumped version of test helper
* Fixed test that was creating a text string data type with too large a maximum characters setting.
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Co-authored-by: Andy Butland <abutland73@gmail.com>
Co-authored-by: Nhu Dinh <hnd@umbraco.dk>
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