Include buffered multipart form data request

[staizen-alexm]

Environment (please complete the following information):

• Package version: 4.1.6
• Node.js version: 14.16.1
• NPM version: 6.14.12
• Browser name and version: Chrome 92
• Platform name and version: MacOSX

Describe the bug
browser.getRequests() give an empty request body for an intercepted multipart/form-data type request

To Reproduce
just to give an idea of the flow:

browser.url('http://foo.bar');
browser.setupInterceptor();
browser.click('#button');

**multipart formdata request happens**

browser.getRequests();

Result
See attachment and enquiryForm returned is empty.

[
  {
    url: "http://localhost:1080/sso/api/v1/sendEnquiryEmailNotification/contactUs",
    method: "POST",
    body: {
      attachment: [
        {
        },
      ],
      enquiryForm: [
        {
        },
      ],
    },
    headers: {
      accept: "REDACTED",
      authorization: "REDACTED",
    },
    response: {
      headers: {
        "content-length": "REDACTED",
        "content-type": "REDACTED",
      },
      body: "REDACTED",
      statusCode: 200,
    },
  }
]

Expected behavior
Perhaps return a buffered version of the raw request or return something close to what chrome dev tools does?

------WebKitFormBoundary0EqzZIl45dhs4UWu
Content-Disposition: form-data; name="attachment"; filename="app-pdf.pdf"
Content-Type: application/pdf


------WebKitFormBoundary0EqzZIl45dhs4UWu
Content-Disposition: form-data; name="enquiryForm"; filename="blob"
Content-Type: application/json

{"contactMode":"email","enquiryTopic":"account","message":"REDACTED"}
------WebKitFormBoundary0EqzZIl45dhs4UWu--

[staizen-alexm]

i'll be happy to contribute with the patch if someone can point me on the right bits to look at. thanks!

[iamkenos]

watch 👀