Fix core SDK misuse of "provided" dep for everit_json_schema

[kennknowles]

Fixes #30776

The core SDK has a hard dependency on org.everit.json.schema. Because it was thought of as "optional" it was marked provided. But provided means that the expected runtime will provide a library. It should not be used for "optional". Optionality is achieved by factoring logic into separate modules which a user may choose to depend on or not. In this case, the core SDK has a compile time and runtime dependency on this, so this PR fixes this one dependency (among many) to be correct.

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[kennknowles]

@Polber this is the "more correct" solution but it does change the core SDK deps so probably want @Abacn to look at it.

(it seems like someone wanted this functionality in core but also didn't want core to depend on this and you just can't have it both ways or you get problems like #30776)

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[Abacn]

Thanks, yeah agree it should be implemented. We have similar problem for provided dependencies and the same solution adopted

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