Add JsonSchema fields

[hamnis]

• Move ResourcePlatform to test-helper sbt-project
• Add tests to jsonschema-circe

Fixes #60 and #56

[hamnis]

mima fails as expected

[adamw]

cc @kciesielski I think that's related to your recent work on schemas

[kciesielski]

Thank you for the contribution, @hamnis! OpenAPI uses JSON Schema with some differences, for example $id and const fields are unsupported. Breaking mima by adding these fields would cause runtime errors for .copy calls on Schema if they are not added to the very end of the constructor. However, if you could move them after the extensions field, there should be no issues, at least from what I've quickly checked in my tests. Mima still fails, but copy works in the runtime, so I don't see any more risks, unless you could point some other possible issues I can't think of now?

[hamnis]

@kciesielski i have updated with the requested changes, Please have a look again.

[ahjohannessen]

Scala-steward opened a PR to upgrade apispec-model and openapi-circe-yaml to v0.4.0 and I am getting:

Exception in thread "io-compute-6" java.lang.NoSuchMethodError: 'sttp.apispec.Schema sttp.apispec.Schema.copy(scala.Option, scala.collection.immutable.List, scala.Option, scala.collection.immutable.List, scala.Option, scala.Option, scala.Option, scala.Option, scala.collection.immutable.ListMap, scala.collection.immutable.ListMap, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.collection.immutable.List, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.Option, scala.collection.immutable.ListMap)

[adamw]

@ahjohannessen a tapir release compatible with the above follows shortly - assuming you also have tapir in the classpath.

[ahjohannessen]

@adamw Yep 👍