feat(API): implement AppSyncRealTimeClient and WebSocketClient with URLSession

[5d]

Issue #

Description

• Removing the dependency of aws-appsync-realtime-client-ios.
• Utlizing URLSessionWebSocketTask for AppSync real-time WebSocket connection.
• Reimplemented the AppSyncRealTimeClient.

General Checklist

• [x] Added new tests to cover change, if needed
• [x] Build succeeds with all target using Swift Package Manager
• [x] All unit tests pass
• [x] All integration tests pass
• [ ] Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• [x] Documentation update for the change if required
• [x] PR title conforms to conventional commit style
• [ ] New or updated tests include Given When Then inline code documentation and are named accordingly testThing_condition_expectation()
• [ ] If breaking change, documentation/changelog update with migration instructions

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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.53110% with 258 lines in your changes are missing coverage. Please review.

Project coverage is 68.35%. Comparing base (358699c) to head (ec4519f).

Files	Patch %	Lines
.../AppSyncRealTimeClient/AppSyncRealTimeClient.swift	59.65%	94 Missing :warning:
...r/SubscriptionInterceptor/IAMAuthInterceptor.swift	0.00%	38 Missing :warning:
...ore/AWSPluginsCore/WebSocket/WebSocketClient.swift	84.11%	27 Missing :warning:
...criptionFactory/AppSyncRealTimeClientFactory.swift	70.58%	25 Missing :warning:
...n/Operation/AWSGraphQLSubscriptionTaskRunner.swift	88.70%	14 Missing :warning:
...meClient/AppSyncRealTimeClient+HandleRequest.swift	80.00%	13 Missing :warning:
...ncRealTimeClient/AppSyncRealTimeSubscription.swift	77.19%	13 Missing :warning:
Amplify/Core/Support/JSONValue.swift	68.96%	9 Missing :warning:
...bscriptionInterceptor/CognitoAuthInterceptor.swift	82.05%	7 Missing :warning:
...SPluginsCore/WebSocket/AmplifyNetworkMonitor.swift	61.11%	7 Missing :warning:
... and 5 more

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Additional details and impacted files

@@                         Coverage Diff                          @@
##           feat/url-session-web-socket-task    #3527      +/-   ##
====================================================================
- Coverage                             68.47%   68.35%   -0.13%     
====================================================================
  Files                                  1077     1084       +7     
  Lines                                 36282    36927     +645     
====================================================================
+ Hits                                  24844    25241     +397     
- Misses                                11438    11686     +248     

Flag	Coverage Δ
API_plugin_unit_test	67.80% <71.91%> (+0.30%)	:arrow_up:
AWSPluginsCore	68.70% <84.09%> (+1.80%)	:arrow_up:
Amplify	48.21% <70.96%> (+0.09%)	:arrow_up:
Analytics_plugin_unit_test	81.16% <ø> (ø)
Auth_plugin_unit_test	79.01% <ø> (-0.11%)	:arrow_down:
CoreMLPredictions_plugin_unit_test	59.44% <ø> (ø)
DataStore_plugin_unit_test	81.37% <ø> (-1.09%)	:arrow_down:
Geo_plugin_unit_test	70.75% <ø> (ø)
Logging_plugin_unit_test	62.87% <ø> (ø)
Predictions_plugin_unit_test	37.16% <ø> (ø)
PushNotifications_plugin_unit_test	87.13% <ø> (ø)
Storage_plugin_unit_test	77.61% <ø> (ø)
unit_tests	68.35% <74.53%> (-0.13%)	:arrow_down:

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