Added configuration to allow cross origin cookies

[DellanX]

Description

Adds a configuration setting to enable cross origin cookies (credentials set to include on Fetch API calls) This is needed for cross-origin API calls with cookie-based authentication. I didn't add testing, as it'd require configuring CORS on the backend. That being said, I have sideloaded the code into my application and can now execute cross-origin requests successfully. (It's a low-risk feature, as it is a configuration setting passed into the connection class, defaults to the 'same-origin' that was previously hardcoded)

Fixes #17

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

None, only validate by sideloading into an application. (Cookies are a great weakness of mine, I don't know how to test them)

Checklist before requesting a review

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my code
• [X] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [X] Any dependent changes have been merged and published in downstream modules

[DellanX]

Closed, request can be recreated with custom parameters such as credentials:

  jsonApiRequestInterceptor: (request: Request) => {
    console.log(request.url)
    request = new Request(request, {
      credentials: 'include',
    })
    const token = Cookies.get('XSRF-TOKEN');
    request.headers.append('X-XSRF-TOKEN', token ?? '');
    return request;
  },