Update Step Function Context Parsing

[kimi-p]

What does this PR do?

Update Step Function context parsing. Other PRs to use this Step Function context will be added in later weeks.

Motivation

The original event format with additional dd field in the payload was added back in 2019 for one private beta customer. The current event format looks like this:

AWS Step Functions context object doc: https://docs.aws.amazon.com/step-functions/latest/dg/input-output-contextobject.html

{
    "Execution": {
        "Id": "arn:aws:states:sa-east-1:425362996713:express:logs-to-traces-sequential:774c6ee3-5f13-2fd9-1b7a-ac145d303a00:2de41e71-7adb-457c-a8b1-f323d7c49788",
        "Input": {
            "Comment": "Insert your JSON here"
        },
        "Name": "774c6ee3-5f13-2fd9-1b7a-ac145d303a00",
        "RoleArn": "arn:aws:iam::425362996713:role/service-role/StepFunctions-logs-to-traces-sequential-role-ccd69c03",
        "StartTime": "2022-12-09T16:10:28.936Z"
    },
    "StateMachine": {
        "Id": "arn:aws:states:sa-east-1:425362996713:stateMachine:logs-to-traces-sequential",
        "Name": "logs-to-traces-sequential"
    },
    "State": {
        "Name": "Lambda Invoke - First",
        "EnteredTime": "2022-12-09T16:10:28.941Z",
        "RetryCount": 0
    }
}

Testing Guidelines

Only unit test needed as no lambda has Step Functions context now.

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)

[codecov-commenter]

Codecov Report

Merging #325 (f322331) into main (d44d456) will decrease coverage by 8.96%.
The diff coverage is 68.87%.

❗ Current head f322331 differs from pull request most recent head 6cd1236. Consider uploading reports for the commit 6cd1236 to get more accurate results

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
- Coverage   87.65%   78.68%   -8.97%     
==========================================
  Files          29       36       +7     
  Lines         972     1783     +811     
  Branches      169      414     +245     
==========================================
+ Hits          852     1403     +551     
- Misses         82      327     +245     
- Partials       38       53      +15     

Impacted Files	Coverage Δ
src/runtime/errors.ts	0.00% <0.00%> (ø)
src/runtime/index.ts	0.00% <0.00%> (ø)
src/runtime/user-function.ts	0.00% <0.00%> (ø)
src/trace/listener.ts	68.18% <49.23%> (-23.76%)	⬇️
src/trace/span-wrapper.ts	50.00% <50.00%> (ø)
src/trace/tracer-wrapper.ts	80.48% <53.33%> (-12.62%)	⬇️
src/metrics/kms-service.ts	63.15% <56.25%> (+19.40%)	⬆️
src/metrics/listener.ts	85.36% <61.90%> (+15.62%)	⬆️
src/trace/trace-context-service.ts	83.87% <64.28%> (-13.43%)	⬇️
src/trace/context.ts	78.30% <74.07%> (-12.52%)	⬇️
... and 27 more

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[nine5two7]

LGTM

[nine5two7]

LGTM