Maintenance: add validation package to workspace

[dreamorosi]

Summary

To kick off the development of the new Validation utility we need to add a new npm workspace for it.

Why is this needed?

To reduce the barrier of entry and friction to contributing to this new utility.

Which area does this relate to?

Validation

Solution

Initialize a placeholder npm workspace under packages/validation.

Acknowledgment

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

Future readers

Please react with 👍 and your use case to help us understand customer demand.

[github-actions]

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[github-actions]

This is now released under v2.15.0 version!