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[BUG][Go][Bounty] Go client generator doesn't support deepObject in query

See original GitHub issue

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?
[Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Go client generator doesn’t support deepObject in query.

openapi-generator version

v5.3.1

OpenAPI declaration file content or url

openapi: 3.0.0

info:
  title: Example
  description: Example of deepObject failure.
  version: 1.0.0

paths:
  /test:
    get:
      operationId: test
      parameters:
        - name: filter
          in: query
          style: deepObject
          explode: true
          schema:
            type: object
            properties:
              search:
                description: Filter.
                type: string
      responses:
        '200':
          description: Response.

Generation Details

$ docker run --rm -it \
    -v "$(pwd)"/api.yaml:/specs/api.yaml \
    openapitools/openapi-generator-cli:v5.3.1 generate -i /specs/api.yaml -g go -o /sdk/go

Steps to reproduce

store example in api.yaml
run example from “generation details”

expected result: exit code 0 and successful generated content

actual result:

  Exception: null
        at org.openapitools.codegen.DefaultGenerator.processOperation(DefaultGenerator.java:1175)
        at org.openapitools.codegen.DefaultGenerator.processPaths(DefaultGenerator.java:1066)
        at org.openapitools.codegen.DefaultGenerator.generateApis(DefaultGenerator.java:566)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:907)
        at org.openapitools.codegen.cmd.Generate.execute(Generate.java:441)
        at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: java.lang.NullPointerException