refactor: split `AbstractJsonLdTransformer` into 2 different collaborators

[ndr-brt]

Feature Request

AbstractJsonLdTransformer has become too much to handle, it avoids some duplication but it does not provide abstract features that could make the json-ld transformation easier. Actual transformers are still not easy to test.

My proposal would be to have 2 different services:

• JsonLdSerializer (to be used in the JsonObjectFrom...Transformers)
• JsonLdDeserializer (to be used in the JsonObjectTo...Transformers)

that will be user

Which Areas Would Be Affected?

e.g., DPF, CI, build, transfer, etc.

Why Is the Feature Desired?

Are there any requirements?

Who will sponsor this feature?

Please @-mention the committer that will sponsor your feature.

Solution Proposal

If possible, provide a (brief!) solution proposal.

[github-actions]

This issue is stale because it has been open for 14 days with no activity.