refactor(Popup): create overlay for every popup

[chenjiahan]

#6288

[codecov-commenter]

Codecov Report

Merging #6357 into dev will increase coverage by 0.02%.
The diff coverage is 92.59%.

@@            Coverage Diff             @@
##              dev    #6357      +/-   ##
==========================================
+ Coverage   91.23%   91.26%   +0.02%     
==========================================
  Files         171      171              
  Lines        4506     4510       +4     
  Branches      293      292       -1     
==========================================
+ Hits         4111     4116       +5     
- Misses        352      353       +1     
+ Partials       43       41       -2     

Impacted Files	Coverage Δ
src/mixins/popup/overlay.ts	91.66% <89.47%> (+5.95%)	⬆️
src/mixins/popup/context.ts	100.00% <100.00%> (ø)
src/mixins/popup/index.js	100.00% <100.00%> (ø)
src/area/index.js	90.99% <0.00%> (-0.52%)	⬇️

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