Type-checking and IDE completions for HTML tags

[lukechu10]

Fixes #327

[codecov-commenter]

Codecov Report

Merging #354 (e0a7a9c) into master (923c23c) will increase coverage by 0.03%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master     #354      +/-   ##
==========================================
+ Coverage   66.05%   66.08%   +0.03%     
==========================================
  Files          48       48              
  Lines        7294     7304      +10     
==========================================
+ Hits         4818     4827       +9     
- Misses       2476     2477       +1     

Impacted Files	Coverage Δ
packages/sycamore/src/lib.rs	100.00% <ø> (ø)
packages/sycamore/src/suspense.rs	90.51% <50.00%> (-0.67%)	⬇️
packages/sycamore-macro/src/view/codegen.rs	95.90% <100.00%> (+0.06%)	⬆️
packages/sycamore/src/component.rs	66.66% <100.00%> (+3.33%)	⬆️

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