feat(instrumentation-aws-sdk): add gen ai metrics for bedrock

[anuraaga]

Which problem is this PR solving?

• Gen AI defines metrics that should be applied for operations like bedrock runtime

Short description of the changes

• Allows propagating meter to service extensions
• Passes start time to service extensions to allow them to compute operation duration as needed
• Implement metrics for bedrock service extension
• Refactor tests to share a single instrumentation instance

/cc @trentm @codefromthecrypt

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.69%. Comparing base (f6bc4cc) to head (c050b89).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2771      +/-   ##
==========================================
+ Coverage   89.67%   89.69%   +0.02%     
==========================================
  Files         184      184              
  Lines        8946     8966      +20     
  Branches     1834     1835       +1     
==========================================
+ Hits         8022     8042      +20     
  Misses        924      924              

Files with missing lines	Coverage Δ
...entelemetry-instrumentation-aws-sdk/src/aws-sdk.ts	92.77% <100.00%> (+0.17%)	⬆️
...entelemetry-instrumentation-aws-sdk/src/semconv.ts	100.00% <100.00%> (ø)
...ntation-aws-sdk/src/services/ServicesExtensions.ts	96.87% <100.00%> (+0.32%)	⬆️
...umentation-aws-sdk/src/services/bedrock-runtime.ts	98.89% <100.00%> (+0.06%)	⬆️

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[anuraaga]

Thanks @trentm applied the cleanups. Apologies for the delay finally back to work from kubecon

[trentm]

Mostly LGTM. One comment on the init() method below.

@blumamir @jj22ee @trivikr Any comments on the ServiceExtension changes adding metrics support?

[anuraaga]

Thanks - updated semconv

[jj22ee]

@trentm The metrics support in ServiceExtension looks good, no concern from me.

[jj22ee]

LGTM!

There is a conflict with main branch right now, most likely due to another Bedrock related PR that got merged from #2777, but I think there should be little to resolve.

[anuraaga]

Sorry for the delay @jj22ee, resolved the conflict

[jj22ee]

Looks like there's another conflict, but it must likely be package-lock.json.