chore(observability): add common internal HTTP metrics to AWS sinks

[gwenaskell]

Summary

Wired common internal HTTP telemetry into the connector used by AWS sinks. This required some modifications to the internal events to provide compatibility with smithy requests and responses.

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Change Type

• Bug fix
• New feature
• Dependencies
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the no-changelog label to this PR.

References

• Closes: AWS components lack custom HTTP metrics as of 0.21.0 #12779

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