feat: add convertDomainToAscii normalization option

[RohanNagar]

Long-awaited feature from #149 🙂

ASCII-fying the entire email is not feasible, but we can provide an ASCII version of the domain as part of normalization.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.89%. Comparing base (9cae2b6) to head (92a8e38).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #361   +/-   ##
=========================================
  Coverage     99.88%   99.89%           
- Complexity      477      510   +33     
=========================================
  Files            20       21    +1     
  Lines           860      939   +79     
  Branches        199      215   +16     
=========================================
+ Hits            859      938   +79     
  Partials          1        1           

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