feat: support linting html in template literals in lowercase

[yeonjuan]

ref #225

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.34%. Comparing base (9a91c9f) to head (08b6512).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #227   +/-   ##
=======================================
  Coverage   98.33%   98.34%           
=======================================
  Files          56       57    +1     
  Lines        1385     1391    +6     
  Branches      384      385    +1     
=======================================
+ Hits         1362     1368    +6     
  Misses         23       23           

Flag	Coverage Δ
unittest	98.34% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
packages/eslint-plugin/lib/rules/lowercase.js	100.00% <100.00%> (ø)
...ckages/eslint-plugin/lib/rules/no-inline-styles.js	100.00% <100.00%> (ø)
packages/eslint-plugin/lib/rules/utils/visitors.js	100.00% <100.00%> (ø)
packages/template-parser/lib/traverser.js	100.00% <100.00%> (ø)

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