feat: OAS3 binary media type support (#4592)

* fix(validator-badge): resolve definition URLs against browser location

* use param as meta parameter if not found

* convert request body from Immutable if necessary

* show file upload for `format: binary` and `format: base64` jsonschema strings

* add `dispatchInitialValue` prop to JsonSchemaForm

* add optional subkey parameter to onChange

* add binary media type support to request body

src/core/plugins/spec/actions.js

@@ -348,7 +348,9 @@ export const executeRequest = (req) =>
 
       if(isJSONObject(requestBody)) {
         req.requestBody = JSON.parse(requestBody)
-      } else {
+      } else if(requestBody && requestBody.toJS) {
+        req.requestBody = requestBody.toJS()
+      } else{
         req.requestBody = requestBody
       }
     }