JSON-Schema-Validator Modul compatible at least with JSON-Schema v7

[TobiasNx]

In context of OERSI we have a JSON-Schema-Validator but it only supports v4.
Will be needed in lobid and in RPB too.

Option/features should be:

• halting or not halting invalid files
• sending invalid files to separate file
• supporting web schemas and local schemas
• supporting modular schemas

[fsteeg]

Implementation should probably start in OERSI, following up on https://gitlab.com/oersi/oersi-etl/-/issues/96#note_679435293 and then moving the working implementation here.

[fsteeg]

Implemented in #468, assigning @TobiasNx for functional review.

Usage e.g. validate-json("/schemas/schema.json", schemaRoot="/schemas/")

(The schemaRoot is for resolving sub-schemas as we have in our setup in OERSI.)

[TobiasNx]

I'm trying to test this: https://github.com/TobiasNx/notWorkingFlux/blob/a59fa2193ca5045a8f5f50b1f47387e4d8ffcb39/jsonValidator

Seems not to work yet, what did I do wrong?