feat(appsync-modelgen-plugin): update Flutter ignored rules and add analysis note

[Jordan-Nelson]

Description of changes

• Update the list of ignored lint rules
• Add note about excluding files from analysis

Issue #, if available

#510

Description of how you validated changes

• Tested against the updated snapshots
• Tested in a sample app with default blog/post/comment schema

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Changes are tested using sample applications for all relevant platforms (iOS/android/flutter/Javascript) that use the feature added/modified

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[Jordan-Nelson]

Formatting changes here and at the end of the file were added automatically in a post commit hook

[codecov-commenter]

Codecov Report

Merging #248 (b5e4503) into master (87c1176) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     aws-amplify/amplify-flutter#248   +/-   ##
=======================================
  Coverage   85.52%   85.53%           
=======================================
  Files         144      144           
  Lines        6605     6609    +4     
  Branches     1517     1489   -28     
=======================================
+ Hits         5649     5653    +4     
  Misses        875      875           
  Partials       81       81           

Impacted Files	Coverage Δ
...appsync-modelgen-plugin/src/configs/dart-config.ts	100.00% <100.00%> (ø)
...delgen-plugin/src/visitors/appsync-dart-visitor.ts	96.91% <100.00%> (+0.02%)	⬆️

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[AaronZyLee]

A temperate solution to fix the lint problems. LGTM 🍨

[dnys1]

Looks good. Thanks!