feat: Babel Plugin - Mock css imports

[bmingles]

Created a Babel transform plugin mockCssImportPlugin that transforms certain css imports into const expressions.

• Replaces import of .module.css / .module.scss - with a const object literal containing a key / value of the module name
• Replaces css imports of ?inline and ?raw with a const string literal matching the import path

The new plugin is configured as a plugin for babel-jest

resolves #1606

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a260842) 46.68% compared to head (9b6bcd8) 46.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1607      +/-   ##
==========================================
- Coverage   46.68%   46.68%   -0.01%     
==========================================
  Files         583      583              
  Lines       36267    36267              
  Branches     9074     9074              
==========================================
- Hits        16933    16930       -3     
- Misses      19282    19285       +3     
  Partials       52       52              

Flag	Coverage Δ
unit	46.68% <ø> (-0.01%)	⬇️

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see 1 file with indirect coverage changes

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