Support output value in AttributeSetter

[SodaDev]

Reasoning:
Add AttributeBuilder, which will extend the AttributeSetter contract with output value. Thanks to that, users can instrument attributes based on the AWS SDK responses.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: SodaDev / name: Marcin Sodkiewicz (6e05dfc, 9309250)

[dmathieu]

This will need a changelog entry.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.5%. Comparing base (00786cc) to head (6e05dfc).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
...github.com/aws/aws-sdk-go-v2/otelaws/attributes.go	66.6%	1 Missing ⚠️
...hub.com/aws/aws-sdk-go-v2/otelaws/snsattributes.go	50.0%	1 Missing ⚠️
...hub.com/aws/aws-sdk-go-v2/otelaws/sqsattributes.go	50.0%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #6543   +/-   ##
=====================================
  Coverage   68.5%   68.5%           
=====================================
  Files        200     200           
  Lines      16768   16800   +32     
=====================================
+ Hits       11490   11519   +29     
- Misses      4933    4937    +4     
+ Partials     345     344    -1     

Files with missing lines	Coverage Δ
...tation/github.com/aws/aws-sdk-go-v2/otelaws/aws.go	95.8% <100.0%> (+0.1%)	⬆️
...ion/github.com/aws/aws-sdk-go-v2/otelaws/config.go	100.0% <100.0%> (ø)
...om/aws/aws-sdk-go-v2/otelaws/dynamodbattributes.go	100.0% <100.0%> (ø)
...github.com/aws/aws-sdk-go-v2/otelaws/attributes.go	89.4% <66.6%> (+7.1%)	⬆️
...hub.com/aws/aws-sdk-go-v2/otelaws/snsattributes.go	81.4% <50.0%> (-6.6%)	⬇️
...hub.com/aws/aws-sdk-go-v2/otelaws/sqsattributes.go	94.4% <50.0%> (-5.6%)	⬇️

... and 3 files with indirect coverage changes