Maintenance: Update CONTRIBUTING.md file

[ConnorKirk]

Why is this needed?

Update CONTRIBUTING.md file with more detail about reviewer and contributor expectations

Which area does this relate to?

No response

Solution

No response

Acknowledgment

• 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

[powertools-for-aws-oss-automation]

Warning

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[github-actions]

This is now released under 3.22.0 version!