feat: [require-closing-tags] Add allowSelfClosingCustom options (fix #99)

[yeonjuan]

• fixes Option to allow any element as self-closing #99

[codecov]

Codecov Report

Merging #109 (e02ad38) into main (8b670a2) will decrease coverage by 0.10%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
- Coverage   97.65%   97.55%   -0.11%     
==========================================
  Files          42       42              
  Lines         811      818       +7     
  Branches      188      195       +7     
==========================================
+ Hits          792      798       +6     
- Misses         16       17       +1     
  Partials        3        3              

Flag	Coverage Δ
unittest	97.55% <93.75%> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...es/eslint-plugin/lib/rules/require-closing-tags.js	97.50% <93.75%> (-2.50%)	⬇️