Add Example Python CDK Stack and Consolidate TypeScript CDK Stacks

[duncanpharvey]

What does this PR do?

• Adds example Python CDK stack with Node, Python, and Go Lambda functions
• Consolidates TypeScript CDK stacks to a single stack with the same Node, Python, and Go Lambda functions

Motivation

https://datadoghq.atlassian.net/browse/SVLS-3956

Testing Guidelines

Detailed in README.md of the example stacks.

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

[duncanista]

Let's add the documentation back, I think it's very important. I imagine they need to be updated. Let's just make sure users can see those docs if they want to use it either in Python or Typescript.

[hestonhoffman]

Left some minor edits, but LGTM

[duncanpharvey]

Left some minor edits, but LGTM

Thanks @hestonhoffman! I committed your suggested changes

[duncanista]

LGTM - left some non-blocking suggestions.