Fix viable phone number and use it in parse logic

[thvdveld]

Fix the check for a valid phone number and use is_viable when parsing.

The regex from the java implementation for checking if a phone number is viable is

DIGITS + "{" + MIN_LENGTH_FOR_NSN + "}" + "|"
      + "[" + PLUS_CHARS + "]*+(?:[" + VALID_PUNCTUATION + STAR_SIGN + "]*" + DIGITS + "){3,}["
      + VALID_PUNCTUATION + STAR_SIGN + VALID_ALPHA + DIGITS + "]*";

Previously, we were checking if we had 3 consecutive digits before alpha characters. However, between these numbers there could be punctuations as well. Which this PR fixes.

Furthermore, I added the is_viable function to the parse logic such that we only continue parsing viable phone numbers, which fixes #80.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.64%. Comparing base (1fd3d17) to head (197feda).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   67.81%   67.64%   -0.18%     
==========================================
  Files          18       18              
  Lines        2172     2185      +13     
==========================================
+ Hits         1473     1478       +5     
- Misses        699      707       +8     

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