feat(xhr-http-handler): add support for per-request/per-operation timeouts

[siddsriv]

Issue

Internal JS-5992

Description

Support per-request timeouts if provided, fallback to the timeout provided in handler config.

Testing

 RUN  v2.1.9 /local/home/sidddsri/workspace/aws-sdk-js-v3/packages/xhr-http-handler

 ✓ src/index.spec.ts (1)
 ✓ src/xhr-http-handler.spec.ts (8) 314ms

 Test Files  2 passed (2)
      Tests  9 passed (9)
   Start at  18:06:33
   Duration  1.10s (transform 129ms, setup 0ms, collect 214ms, tests 317ms, environment 848ms, prepare 181ms)

Additional context

Partner PR in smithy-ts: smithy-lang/smithy-typescript#1636

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