Draft: feat: Report draft support

Closed Pierre Camilleri requested to merge report_draft_support into main

This MR aims at supporting different jsonschema drafts for the validation.

I stopped in the middle, as some 2019-09 draft messages are a bit tricky to implement. Filed an issue on jsonschema repo to simplify this.

Without the simplification, the error specific data for minContains will be easier after !6 (merged) refactorings.

Closes #2.

Edited by Pierre Camilleri

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