feature: support for Parameter.content (#5571)

* add `getParameterSchema` OAS helper

* use `Parameter.content.[firstKey].schema` as schema value when present

* `newValue` -> `initialValue`

* make `paramWithMeta` a const

* add trailing comma to `swagger2SchemaKeys`

* refactor `helpers` to a folder

* deprecate `src/core/utils.js` in favor of `src/core/helpers/`

* support `Parameter.content.[mediaType].schema` in validateParam

* reject `null` as an OAS3 object value

* expose Fetch errors in the browser console

* generate ParameterRow default values based on `content` values

* add tests for `getParameterSchema`

* remove debugger statement

* remove debugger statement

* don't apply `generatedSampleValue`s to parameters with `examples`

* remove extra semi

* disable JSON check in parameter runtime validation

* stringify JsonSchema_object textarea values

* add Cypress tests

* swagger-client@3.9.4

src/core/plugins/spec/actions.js

@@ -436,9 +436,12 @@ export const executeRequest = (req) =>
       specActions.setResponse(req.pathName, req.method, res)
     } )
     .catch(
-      err => specActions.setResponse(req.pathName, req.method, {
-        error: true, err: serializeError(err)
-      })
+      err => {
+        console.error(err)
+        specActions.setResponse(req.pathName, req.method, {
+          error: true, err: serializeError(err)
+        })
+      }
     )
   }