feat: support vertical-align in inline styles

[Sub6Resources]

Fixes #1107

[codecov]

Codecov Report

Patch coverage: 89.65% and project coverage change: +0.57 🎉

Comparison is base (d7247cb) 58.62% compared to head (cd8381c) 59.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1266      +/-   ##
==========================================
+ Coverage   58.62%   59.20%   +0.57%     
==========================================
  Files          37       37              
  Lines        2642     2652      +10     
==========================================
+ Hits         1549     1570      +21     
+ Misses       1093     1082      -11     

Impacted Files	Coverage Δ
lib/src/css_parser.dart	16.19% <72.72%> (+2.11%)	⬆️
lib/src/style.dart	84.80% <100.00%> (-0.08%)	⬇️

... and 2 files with indirect coverage changes

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