[typescript-axios] doesn't serialize deepObject query params

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
  input: {day: 20, year: {min: 1990, max: 2000}}
  actual output: ?day=20&year
  expected output: ?day=20&year[min]=1990&year[max]=2000

Description

I'm using [typescript-axios] api client generator. Some of the properties I pass to it specified as deepObject. It looks that it doesn't support this type of args at all. Is there any possible ways to fix it?

openapi-generator version

v4.3.1
v5.0.0-beta

OpenAPI declaration file content or url

YearRange:
      in: query
      name: year
      required: false
      style: deepObject
      schema:
        type: object
        properties:
          min:
            type: string
            example: 2010
          max:
            type: string
            example: 2019

Generation Details

[typescript-axios] generator

Steps to reproduce

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/6075

Suggest a fix

Replace old deprecated url API with URLSearchParams.

Start with the typescript-axios generator entry point and reproduce the issue using the OpenAPI declaration and input shown here. Trace query serialization for the deepObject parameter, then verify that the generated client produces the expected bracketed year[min] and year[max] query parameters.