feat: Express Import ruleset JSON

[arumsey]

Description

This pull request adds a new import ruleset feature to the AEM Importer. An import ruleset is an abstraction on top of the existing helix-importer import scripts that allows for an import to be fully defined using a JSON object. Such an object enables easier machine generation of import rules and can be used as input to a cloud based import API.

An import JSON can be used as input to Import - Workbench, just like an import.js. An import.js can even consume an import.json if it wants to perform more complex operations. This allows a less techical business owner to perform a large percentage of grunt work using section mapping to create an initial pass at importing. A developer could then be involved just to solve the more complicated edge cases.

Over time the intent will be that through a combination of ruleset logic and custom parsers there will never be a need to write any custom import.js. This should decrease the time needed to import a site to Edge Delivery as well as enable the import of a large site to be managed by the Spacecat import APIs.

• rebranding section mapping to Import - Express!
• add support for import rules JSON
• convert section mapping to import rules
• download import rules
• toggle usage of import rules vs section mapping

Related Issue

355

Motivation and Context

• extending AEM Importer to more non-technical users
• decreasing the time required to perform an import

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[arumsey]

@arumsey, overall LGTM. I commented some minor points. I see many changes in the js/dist/ folder, can you detail why they happened?

@catalan-adobe The import rules feature has been added as an addition to the helix-importer module which requires a rebuild (npm run build). This decision was made so that import rules could potnetially be moved to helix-importer for easier consumption by the importer service in Spacecat.

[arumsey]

Thanks for committing the requested changes @atopper. These look good to me as a first pass at integrating import rules with section mapping.

[atopper]

@catalan-adobe There's a good chance that Anthony and I do not have permission to merge this. Could you do it? We can discuss merge requirements & permissions next week or beyond.