Fix Bedrock instrumentation TextDecoder error with robust type handling

[mxiamxia]

Issue #, if available:

Description of changes:
OTel Instrumentation throws TextDecoder error on BedrockRuntime.InvokeModelWithResponseStream API response

• Fix "The 'list' argument must be an instance of SharedArrayBuffer, ArrayBuffer or ArrayBufferView" error in BedrockRuntimeServiceExtension.responseHook()
• Add type checking to handle different response body types from AWS SDK middleware:
  • String: Already processed by AWS SDK (Uint8ArrayBlobAdapter)
  • Uint8Array: Raw binary from AWS (decode with TextDecoder)
  • Buffer: Node.js Buffer (convert with toString('utf8'))
  • Unexpected types: Log debug message and skip processing gracefully

Test

1. Reproduced the issue by using latest release with InvokeModelWithResponseStream

  events: [
    {
      name: 'exception',
      attributes: {
        'exception.type': 'ERR_INVALID_ARG_TYPE',
        'exception.message': 'The "list" argument must be an instance of SharedArrayBuffer, ArrayBuffer or ArrayBufferView.',
        'exception.stacktrace': 'TypeError: The "list" argument must be an instance of SharedArrayBuffer, ArrayBuffer or ArrayBufferView.\n' +
          '    at TextDecoder.decode (node:internal/encoding:443:16)\n' +
          '    at BedrockRuntimeServiceExtension.responseHook (/Users/xiami/Documents/workspace/apm/aws-otel-js-instrumentation/sample-applications/simple-express-server/node_modules/@aws/aws-distro-opentelemetry-node-autoinstrumentation/build/src/patches/aws/services/bedrock.js:303:59)\n' +
          '    at ServicesExtensions.responseHook (/Users/xiami/Documents/workspace/apm/aws-otel-js-instrumentation/sample-applications/simple-express-server/node_modules/@opentelemetry/instrumentation-aws-sdk/build/src/services/ServicesExtensions.js:37:154)\n' +
          '    at /Users/xiami/Documents/workspace/apm/aws-otel-js-instrumentation/sample-applications/simple-express-server/node_modules/@opentelemetry/instrumentation-aws-sdk/build/src/aws-sdk.js:257:53\n' +
          '    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)'
      },
      time: [ 1753815032, 337792 ],
      droppedAttributesCount: 0
    }
  ],
  links: []

2. Tested with the fix and the issue is gone

  name: 'BedrockRuntime.InvokeModelWithResponseStream',
  id: '1d23a4c6f2498f7f',
  kind: 2,
  timestamp: 1753815031313000,
  duration: 687392.625,
  attributes: {
    'rpc.system': 'aws-api',
    'rpc.method': 'InvokeModelWithResponseStream',
    'rpc.service': 'BedrockRuntime',
    'gen_ai.system': 'aws.bedrock',
    'gen_ai.request.model': 'anthropic.claude-3-5-sonnet-20240620-v1:0',
    'gen_ai.request.max_tokens': 1000,
    'gen_ai.request.temperature': 0.7,
    'gen_ai.request.top_p': 0.9,
    'aws.is.local.root': false,

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