feat: add Bedrock InvokeModelWithResponseStream instrumentation

[yuliia-fryshko]

Which problem is this PR solving?

Adds instrumentation of the InvokeModelWithResponseStreamCommand in the AWS Bedrock SDK.

Short description of the changes

• Captures GenAI semantic span attributes for Amazon Titan, Anthropic Claude, Amazon Nova models.
• Ensures span.end() is deferred until the full stream is consumed.
• instrumentAsyncIterable is used to inspect streamed chunks in real time and extract relevant telemetry.
• Includes unit tests for Titan, Claude and Nova models.

[trentm]

Is there a reason to not re-use requestPreSpanHookInvokeModel: add a 4th isStream argument and pass in false for 'InvokeModel', true for 'InvokeModelWithResponseStream', and then make the minor update to the implementation? This is how it was done for 'Converse' and 'ConverseStream'.

It looks to me like the requestPreSpanHookInvokeModel and requestPreSpanHookInvokeModelWithResponseStream functions are almost identical ... except that the latter doesn't have blocks for 'meta.llama', 'cohere.*', and 'mistral'.

[yuliia-fryshko]

Thanks for the suggestion, @trentm ! You are absolutely right! I've updated the code to consolidate requestPreSpanHookInvokeModel and requestPreSpanHookInvokeModelWithResponseStream into a single method using isStream parameter as you suggested.

[codecov]

Codecov Report

Attention: Patch coverage is 96.72131% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.73%. Comparing base (2ac08ff) to head (fcf3ff5).

Files with missing lines	Patch %	Lines
...umentation-aws-sdk/src/services/bedrock-runtime.ts	96.72%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2845      +/-   ##
==========================================
+ Coverage   89.69%   89.73%   +0.04%     
==========================================
  Files         185      185              
  Lines        9034     9093      +59     
  Branches     1852     1870      +18     
==========================================
+ Hits         8103     8160      +57     
- Misses        931      933       +2     

Files with missing lines	Coverage Δ
...umentation-aws-sdk/src/services/bedrock-runtime.ts	98.44% <96.72%> (-0.55%)	⬇️

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