Feature/extract task provider

[tomaszmichalak]

Fragments modules refactor: Knotx/knotx-fragments#154.

Upgrade notes (if appropriate)

Some modules are replaced:

• io.knotx:knotx-fragments-action-core -> io.knotx:knotx-fragments-action-core + io.knotx:knotx-fragments-action-library
• knotx-fragments-handler-core -> knotx-fragments-task-handler + knotx-fragments-task-factory-default
• knotx-fragments-handler-consumer-html -> io.knotx:knotx-fragments-task-handler-log-html
• knotx-fragments-handler-consumer-json -> io.knotx:knotx-fragments-task-handler-log-json

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:

• 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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