new rule: padding-lines-between-tags #3554

[etherealm13]

#3554 Rule to disallow blank lines between tags
Based on https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/padding-line-between-tags.js

[etherealm13]

@ljharb Let me know your thoughts.

[codecov]

Codecov Report

Attention: Patch coverage is 22.97297% with 57 lines in your changes missing coverage. Please review.

Project coverage is 97.19%. Comparing base (c6fdccd) to head (6eeab0b).

Files	Patch %	Lines
lib/rules/padding-lines-between-tags.js	22.97%	57 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3789      +/-   ##
==========================================
- Coverage   97.75%   97.19%   -0.57%     
==========================================
  Files         135      136       +1     
  Lines        9715     9789      +74     
  Branches     3527     3553      +26     
==========================================
+ Hits         9497     9514      +17     
- Misses        218      275      +57     

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[ljharb]

A few changes, but in particular, it would need thorough tests.