feat: insert a new declaration to arbitrary position

[ktsn]

ref #13

[codecov]

Codecov Report

Merging #73 into master will increase coverage by 0.24%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
+ Coverage   68.04%   68.29%   +0.24%     
==========================================
  Files          66       66              
  Lines        2244     2252       +8     
  Branches      455      463       +8     
==========================================
+ Hits         1527     1538      +11     
+ Misses        697      694       -3     
  Partials       20       20

Impacted Files	Coverage Δ
src/view/components/StyleInformation.vue	80% <100%> (+14.37%)	⬆️

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