Knotx 2.2 upgrade

[scypio]

Adjust knotx-example-project for upcoming knotx 2.2 version

Description

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

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.

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