Verify v2 Validation Updates

[superchilled]

This PR adds some validtion checks to the Verify v2 implementation. Specifically it:

• Adds a check to the SMS class from setter to ensure that:
  • Numeric values are between 11 and 15 characters in length
  • Alphanumeric values are between 3 and 11 characters in length
• Adds a check to the WhatsApp class from setter to ensure that values are between 11 and 15 characters in length
• Adds a check in the Verify2#start_verification method to ensure that the brand argument is between 1 and 16 characters in length

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.31%. Comparing base (35e4214) to head (17cb17b).

❗ Current head 17cb17b differs from pull request most recent head 22f9655. Consider uploading reports for the commit 22f9655 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #309      +/-   ##
==========================================
+ Coverage   98.19%   98.31%   +0.11%     
==========================================
  Files         132      132              
  Lines        2333     2313      -20     
==========================================
- Hits         2291     2274      -17     
+ Misses         42       39       -3     

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