Add support for Kiro Powers

[cruftyoldsysadmin]

It would be great if Paks could also generate Powers for use with AWS Kiro.

Context

• https://kiro.dev/powers/#can-i-stack-kiro-powers
• https://kiro.dev/docs/powers/
• https://kiro.dev/docs/powers/create/

[kajogo777]

@cruftyoldsysadmin just to understand better, do you mean you want to be able to use Agent Skills within Kiro (ability to import Agent Skills to Kiro)? or publish and share Kiro Powers?