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ClassCastException Thrown when referring json file in request body with content type "multipart/form-data"

See original GitHub issue

Issue:

With content-type:"multipart/form-data" getting java.lang.ClassCastException when referring json file for additional payload in Request Body apart from "files": [ "file:media/test.wav" ]

Request step:

{
  "name": "save_config",
  "url": "/config",
  "operation": "POST",
  "request": {
    "headers": "${JSON.FILE:standard_headers_media.json}",
    "body": {
      "files": [
        "file:media/test.wav"
      ],
      "metadata": "${JSON.FILE:metadata.json}"
    }
  },
  "assertions": {
    "status": 201,
    "headers": {
      "${correlationId.header}": "$NOT.NULL"
    }
  }
}

metadata.json

{
  "name": "name",
  "fileName": "test.wav",
  "location": "location",
}

standard_headers_media.json:

{
  "Content-Type": "multipart/form-data"
}

Error:

java.lang.RuntimeException: java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class java.lang.String
 (java.util.LinkedHashMap and java.lang.String are in module java.base of loader 'bootstrap')

Stactrace:

 Caused by: java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class java.lang.String
  (java.util.LinkedHashMap and java.lang.String are in module java.base of loader 'bootstrap')
	at org.jsmart.zerocode.core.httpclient.utils.FileUploadUtils.buildOtherRequestParams(FileUploadUtils.java:60)
	at org.jsmart.zerocode.core.httpclient.BasicHttpClient.createFileUploadRequestBuilder(BasicHttpClient.java:356)
	at org.jsmart.zerocode.core.httpclient.BasicHttpClient.createRequestBuilder(BasicHttpClient.java:400)
	at org.jsmart.zerocode.core.httpclient.BasicHttpClient.execute(BasicHttpClient.java:126)
	at org.jsmart.zerocode.core.engine.executor.JsonServiceExecutorImpl.executeRESTInternal(JsonServiceExecutorImpl.java:131)
	at org.jsmart.zerocode.core.engine.executor.JsonServiceExecutorImpl.executeRESTService(JsonServiceExecutorImpl.java:92)