Tech debt: Add from __future__ import annotations to all files, including examples

[leandrodamascena]

Why is this needed?

Reference: #4607

Add from future import annotations to all files, including examples

cc @ericbn

Which area does this relate to?

Automation

Suggestion

No response

Acknowledgment

• [X] This request meets Powertools for AWS Lambda (Python) Tenets
• [ ] Should this be considered in other Powertools for AWS Lambda languages? i.e. Java, TypeScript, and .NET