fix: refactor the way classes are formatted to account for shorthand

[LuLaValva]

Motivation and Context

• Fixes Mixing class attribute with class shorthand results in unexpected output #15

Description

• Refactored the way that classes and ids are handled by plugin
• Decisions made for this PR:
  • Class names are auto-shorthanded when they are string literals which are never dynamic, immediately after the class keyword or in an array.
  • Class lists of length 1 are automatically converted to atoms

Checklist:

• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: LuLaValva / name: Luke LaValva (72bd370)

[codecov]

Codecov Report

Base: 95.32% // Head: 94.96% // Decreases project coverage by -0.36% ⚠️

Coverage data is based on head (72bd370) compared to base (b14f267).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   95.32%   94.96%   -0.37%     
==========================================
  Files          11       11              
  Lines         364      377      +13     
  Branches      111      116       +5     
==========================================
+ Hits          347      358      +11     
- Misses         12       13       +1     
- Partials        5        6       +1     

Impacted Files	Coverage Δ
src/index.ts	94.75% <100.00%> (+0.28%)	⬆️
src/utils/get-original-code.ts	77.77% <0.00%> (-22.23%)	⬇️

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