feat: add linguiSwcOptions helper

[mogelbrod]

• Export linguiSwcOptions() helper from @lingui/swc-plugin/options that enables automatic deriving of SWC related options from the Lingui config file
• Add @lingui/conf 5 || 6 as a dependency to access the config through
• Restructure the README file, grouping config examples together and converting comment based option docs into structured content

Idea from this discord thread

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.49%. Comparing base (f4fb0a0) to head (5896227).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #212   +/-   ##
=======================================
  Coverage   94.49%   94.49%           
=======================================
  Files           9        9           
  Lines        2161     2161           
=======================================
  Hits         2042     2042           
  Misses        119      119           

Flag	Coverage Δ
unittests	94.49% <ø> (ø)

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