feat: EmailField

[rafamizes]

Closes #8

[codecov]

Codecov Report

Merging #27 (9e4e753) into master (e013cf0) will increase coverage by 0.57%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   91.44%   92.02%   +0.57%     
==========================================
  Files           6        7       +1     
  Lines         152      163      +11     
==========================================
+ Hits          139      150      +11     
  Misses         13       13              

Impacted Files	Coverage Δ
lib/src/net/email_field.dart	100.00% <100.00%> (ø)

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