Add support for the new SearchBox API

[eugenes78]

• Expose baseUrl to be used by all engine types (if set)
• Infer the engine type from the environment variables or project properties
• First draft of the tests
• Support SearchBox in SearchResultFactory

Description

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Checklist

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have updated the CHANGELOG including this PR (where applicable)
• [ ] I have run tests and automatic checks locally
• [ ] I have run pitest check locally and checked that the coverage increased (or didn't change) or decreased insignificantly
• [ ] I have made corresponding changes to the documentation (where applicable)
• [ ] I have grouped commits logically or I promise to squash my commits before merge