Upgrade/2.2.0

[tomaszmichalak]

Adjust knotx-example-project for knotx 2.2 version.

Description

Update API, configuration and gradle build files to address changes required by Knotx 2.2.

Summary for this PR is defined here.

Motivation and Context

It would is nice to have a working example project

Screenshots (if appropriate)

Upgrade notes (if appropriate)

N/A

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

---

I hereby agree to the terms of the Knot.x Contributor License Agreement.