feat: add sns -> lambda support

[michael-zhao459]

What does this PR do?

Add SNS -> lambda support for DSM

Motivation

Users requesting lambda support

Testing Guidelines

Unit tested the functions

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)

[michael-zhao459]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat: add sns->sqs->lambda support #618
• feat: add kinesis -> lambda support #614
• feat: add sns -> lambda support #613 👈 (View in Graphite)
• refactor: remove tracer dependencies to support dsm sqs -> lambda #612
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.