Add an option to disable session cache in NodeHttp2Handler

[trivikr]

Is your feature request related to a problem? Please describe.

The services which support Http2 streaming might limit max concurrent connections on the server side. This leads to an error being thrown if concurrent requests more than maxConcurrentConnections are created on the client side which share an HTTP2 session.

The issue with AWS Transcribe Streaming is explained in repo https://github.com/jjtindale/aws-parallel-transcribe-repro
The error thrown in Node.js with concurrent requests more than maxConcurrentConnections is explained in https://github.com/trivikr/node-http2-parallel-requests-on-session

Describe the solution you'd like

Add an option to disable session cache in NodeHttp2Handler. This would ensure that a new session is created for every request.

For example:

const client = new TranscribeStreamingClient({
  requestHandler: new NodeHttp2Handler({
    disableSessionCache: true
  }),
});

Describe alternatives you've considered

Write my own Http2Handler which does not share ClientHttp2Sessions between requests.

[github-actions]

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