feat: support vertical-align in inline styles

[Sub6Resources]

Fixes #1107

[codecov[bot]]

Codecov Report

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

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

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/Sub6Resources/flutter_html/pull/1266?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Whitaker) | Coverage Δ | | |---|---|---| | [lib/src/css\_parser.dart](https://app.codecov.io/gh/Sub6Resources/flutter_html/pull/1266?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Whitaker#diff-bGliL3NyYy9jc3NfcGFyc2VyLmRhcnQ=) | `16.19% <72.72%> (+2.11%)` | :arrow_up: | | [lib/src/style.dart](https://app.codecov.io/gh/Sub6Resources/flutter_html/pull/1266?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Whitaker#diff-bGliL3NyYy9zdHlsZS5kYXJ0) | `84.80% <100.00%> (-0.08%)` | :arrow_down: | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/Sub6Resources/flutter_html/pull/1266/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matthew+Whitaker)

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