[SVLS-5560] Inject DD trace context into AWS Step Functions input

[DylanLovesCoffee]

What does this PR do?

Adds an instrumentation for AWS SDK Step Functions. This enables tracing for when a Lambda function invokes a Step Function. Trace context is injected into the Step Function's StartExecution/StartSyncExecution.Input object.

The Logs to Traces Reducer will read the trace context from the Step Function logs and create a Step Function span.

Motivation

We want to increase support for step function tracing as a whole. This PR supports tracing a step function that has been called downstream of a Lambda function.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.
• Add an appropriate team label so this PR gets put in the right place for the release notes.
• Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

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[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-22 21:24:22

Comparing candidate commit acab365 in PR branch dylan/sfn-trace-ctx with baseline commit 2edf445 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 58 metrics, 1 unstable metrics.