chore(api): use library.yaml lint rules and reformat to match

[ragingsquirrel3]

Changes API category lint rules to library.yaml and then changes all the offending code to pass analysis. There is no CI enforcement of that here (want to do in separate PR) but there should be no output from flutter analyze.

No functional changes, just code formatting.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #2171 (1c806a0) into feat/api-next (baddbb9) will increase coverage by 0.10%. The diff coverage is 90.82%.

@@                Coverage Diff                @@
##           feat/api-next    #2171      +/-   ##
=================================================
+ Coverage          39.11%   39.22%   +0.10%     
=================================================
  Files                118      117       -1     
  Lines               6897     6906       +9     
=================================================
+ Hits                2698     2709      +11     
+ Misses              4199     4197       -2     

Flag	Coverage Δ
android-unit-tests	∅ <ø> (∅)
flutter-unit-tests	27.04% <90.82%> (+0.13%)	:arrow_up:
ios-unit-tests	95.36% <ø> (+0.23%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/api/amplify_api/lib/amplify_api.dart	100.00% <ø> (ø)
...kages/api/amplify_api/lib/src/api_plugin_impl.dart	78.76% <ø> (ø)
...ib/src/graphql/app_sync_api_key_auth_provider.dart	100.00% <ø> (ø)
...api/amplify_api/lib/src/graphql/model_queries.dart	83.33% <ø> (ø)
...plify_api/lib/src/graphql/model_subscriptions.dart	85.71% <ø> (ø)
...b/src/graphql/oidc_function_api_auth_provider.dart	100.00% <ø> (ø)
...ges/api/amplify_api/lib/src/native_api_plugin.dart	9.09% <ø> (ø)
...ib/src/util/amplify_authorization_rest_client.dart	85.71% <ø> (ø)
..._api/lib/src/graphql/ws/web_socket_connection.dart	60.22% <80.00%> (+0.45%)	:arrow_up:
...ackages/api/amplify_api/lib/src/graphql/utils.dart	90.76% <83.87%> (-0.76%)	:arrow_down:
... and 12 more