Maintenance: V2 updates - review interface & propose improvements for Validation module

[scottgerring]

Summary

We should use the V2 release as an opportunity to reflect upon the interfaces of our existing modules and identify areas of improvement. This work has been done as part of rewrites for some modules, and in isolation for others - check out #1283 for details.

Why is this needed?

• Minimize the likelihood that we need to make more breaking changes to PT-Java again soon in the future
• Double-down on the quality of the project by forcing large-scale code review
• Increase knowledge of the modules around the contributor team

Which area does this relate to?

Validation

Solution

1. A review of the current module, its public interface and structure, and potential areas for improvement documented on this ticket for discussion
2. A draft PR against the v2 branch showing the high level impact of proposed changes
3. PR completed and merged into v2

Acknowledgment

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

[scottgerring]

We should resolve this and #1298 at the same time.

[skal111]

Happy to take that one