feat(experimentalIdentityAndAuth): add event streaming input integrations relative to auth

[syall]

Issue

Issue number, if available, prefixed with "#"

N/A.

Description

What does this implement/fix? Explain your changes.

Add event streaming input integrations relative to auth.

• feat(experimentalIdentityAndAuth): remove AddEventStreamHandlingDependency experimental branch
• feat(experimentalIdentityAndAuth): add order for AddWebsocketPlugin

Testing

How was this change tested?

See the diff in this branch: https://github.com/syall/aws-sdk-js-v3/tree/TEMP-streaming

• commit (may be outdated): syall@82f2e6f

The following clients (services with event stream inputs) compile correctly:

• client-lex-runtime-v2
• client-rekognitionstreaming
• client-transcribe-streaming

yarn generate-clients -n -g \
codegen/sdk-codegen/aws-models/lex-runtime-v2.json \
codegen/sdk-codegen/aws-models/rekognitionstreaming.json \
codegen/sdk-codegen/aws-models/transcribe-streaming.json \

Additional context

Add any other context about the PR here.

N/A.

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?
• If adding new public functions, did you add the @public tag and enable doc generation on the package?

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