OpenApi query string serialization is not configurable

[chargePanelAndreas]

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---

Describe the bug

There is no way to pass a deepObject with a GET-parameter format that PHP recognizes.

loadOpenAPISubgraph takes a queryStringOptions object but that is ignored in loaders/json-schema addExecutionDirectivesToComposer by falling back to undefined when no operation-specific option has been provided:

            queryStringOptions:
              'queryStringOptions' in operationConfig
                ? operationConfig.queryStringOptions
                : undefined,

Instead we should fallback to the queryStringOptions that is passed in:

            queryStringOptions:
              'queryStringOptions' in operationConfig
                ? operationConfig.queryStringOptions
                : queryStringOptions,

To Reproduce Steps to reproduce the behavior:

This config does not change the behaviour:

export const composeConfig = defineComposeConfig({
  output: 'supergraph.ts',
  subgraphs: [
    {
      sourceHandler: loadOpenAPISubgraph('User', {
...
        queryStringOptions : { arrayFormat: 'brackets' }
      })
    },

Expected behavior

Config should be respected

Environment:

Additional context

Fix:
packages/loaders/json-schema/src/addExecutionLogicToComposer.ts