refactor: Rename to configurator

[naipaka]

🙌 What I did

• Rename to configurator
  • fluttefire_remote_parameter_fetcher -> flutterfire_configurator
  • RemoteParameterFetcher -> Configurator
  • RemoteParameter -> Config
  • flutterfireremoteparameterfetcher -> flutterfireconfigurator

✍️ What I didn't do

✅ Verification

• Android
• iOS
• macOS
• Web

Screenshots

Additional Information

Dependent on #18

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e44f4d1) 54.40% compared to head (96a1333) 54.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   54.40%   54.40%           
=======================================
  Files          10       10           
  Lines         261      261           
=======================================
  Hits          142      142           
  Misses        119      119           

Files	Coverage Δ
...kages/flutterfire_configurator/lib/src/config.dart	100.00% <100.00%> (ø)
...flutterfire_configurator/lib/src/configurator.dart	90.78% <100.00%> (ø)

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[riscait]

Thanks for the rename!