Rebuild project with latest SAM build, and Lambda powertools

[heitorlessa]

Serverless ecosystem evolved a lot since we started this template. We've started Lambda Powertools project with Python being the first language support - Powertools embrace many best practices and developer experience enhancements that we worked around here a few years ago.

This issue is to track a revamp to:

• Use Lambda Powertools - Tracer, Logger for structured logging, and Metrics for custom metrics
• Use Python linters, formatters, security baseline, and other good practices by default
• Use Poetry now that's 1.0
• Use SAM build and suggest VS Code extension as opposed to OS hard link hacks

[heitorlessa]

Reminder: aws-powertools/powertools-lambda-python#33

[heitorlessa]

Resolving as #31 has been merged