[BUG] [typescript-axios] Raw integer parameter incorrectly serialized

Bug Report Checklist

• [x ] Have you provided a full/minimal spec to reproduce the issue?
• [ x] Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• [x ] Have you searched for related issues/PRs?
• [ x] What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

When generating a API with only a raw integer value as the parameter the generator incorrectly serializes the data.

openapi-generator version

5.3.0

OpenAPI declaration file content or url

{
  "swagger" : "2.0",
  "info" : {
    "description" : "This provides the API",
    "version" : "v2",
    "title" : "API",
    "license" : {
      "name" : "Apache 2.0",
      "url" : "http://www.apache.org/licenses/LICENSE-2.0.html"
    }
  },
  "basePath" : "/any",
  "tags" : [  ],
  "schemes" : [ "http", "https" ],
  "paths" : {
    "/test" : {
      "put" : {
        "tags" : [ "stuff" ],
        "summary" : "Does a put operation",
        "description" : "Needs to be accepted as a raw integer",
        "operationId" : "rawInteger",
        "produces" : [ "application/json" ],
        "parameters" : [  {
          "in" : "body",
          "name" : "body",
          "description" : "The integer parameter",
          "required" : true,
          "schema" : {
            "type" : "integer",
            "format" : "int32",
            "default" : 0
          }
        } ],
        "responses" : {
          "412" : {
            "description" : "Failed Reason : invalid"
          }
        }
      }
    }
  }
}

Generation Details

openapi-generator generate -i swagger.json -g typescript-axios

Steps to reproduce

Run the above command with the provided swagger and you will see a serialization method generated which is like the following.

export const serializeDataIfNeeded = function (value: any, requestOptions: any, configuration?: Configuration) {
    const nonString = typeof value !== 'string';
    const needsSerialization = nonString && configuration && configuration.isJsonMime
        ? configuration.isJsonMime(requestOptions.headers['Content-Type'])
        : nonString;
    return needsSerialization
        ? JSON.stringify(value !== undefined ? value : {})
        : (value || "");
}

The serializeDataIfNeeded method is incorrect since the parameter should not be stringified. I think the fix would be to only serialize if the typeof value is equal to object rather than checking if it is not equal to string.

Related issues/PRs

I didn't see any

Suggest a fix

Adjust this template https://github.com/OpenAPITools/openapi-generator/blob/124511e7be0e4a77263b93934de50f8bedf2c3c3/modules/openapi-generator/src/main/resources/typescript-axios/common.mustache#L100-L108 to only serialize if the type is equal to object rather than if it is not equal to string.

Start with modules/openapi-generator/src/main/resources/typescript-axios/common.mustache, especially the serializeDataIfNeeded template referenced in the issue. Generate a typescript-axios client from the supplied Swagger document and inspect the raw integer body handling; done means the generated client preserves that integer correctly without incorrect serialization.