Docs: add JMESPath utility documentation

[dreamorosi]

What were you searching in the docs?

We are about to introduce a new Powertools utility to work with JMESPath.

As a customer I will want to find documentation and code examples of how to use the utility.

Is this related to an existing documentation section?

No response

How can we improve?

We should add a page for the new utility as well as code snippets.

Got a suggestion in mind?

No response

Acknowledgment

• I understand the final update might be different from my proposed suggestion, or refused.

[github-actions]

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