jsonschema has a dependency on the shared util function [FieldJSONInfo](https://github.com/modelcontextprotocol/go-sdk/blob/a02c2ffd0e7fa8d1417dd4b85cd4c0890b15238b/internal/util/util.go#L54) This is preventing us from moving the jsonschema code. We should move this function into jsonschema if possible.