feat: validate payload coming from the provider

[mauromorales]

Since we have the validator, we should validate also a payload coming from the provider plus we can offer providers to validate their payload before sending it

[ci-robbot]

Hello mauromorales, thank you for taking the time to submit an issue in the kairos project. In order for us to better understand and address your suggestion, could you please provide more information? Specifically, could you:

1. Describe the issue in more detail, including any potential problems that may arise from not validating the payload coming from the provider.
2. Provide clear steps to reproduce the issue, if it's a bug.

Additionally, please make sure to mention the versions of the relevant artifacts you are using, such as the kairos version and any other dependencies.

Thank you for your cooperation, and remember that you can always reach out if you have any further questions or concerns. I am a bot, an experiment created by @mudler and @jimmykarily to assist in ticket triage and auditing.