Client - Deep objects are sent as empty string in query parameters

[mezannic]

Describe the bug

The OpenAPI specification allows objects in query, but they do not appear to be supported by feTS client at the serialization step (typings are fine).

To Reproduce Steps to reproduce the behavior:

const client = createClient({
  endpoint: 'https://postman-echo.com'
});

const response = await client['/get'].get({
  query: {
    foo: {
      bar: 'baz',
    },
  },
});

const json = await response.json();
console.log(json.url);
// Expected: 'https://postman-echo.com/get?foo%5Bbar%5D=baz'
// Actual: 'https://postman-echo.com/get?foo='

Expected behavior

Environment:

• OS: macOS
• Package version: 0.4.12:
• Environment: browser extension

[beerose]

fixed in #517