fix: use in NavigationAction request toMap method

[chreck]

Connection with issue(s)

Resolve issue #878

Testing and Review Notes

The request object is not a string anymore:

{"request":{"url":"https://www.google.com/","headers":null,"method":"GET","body":null,"iosAllowsCellularAccess":null,"iosAllowsConstrainedNetworkAccess":null,"iosAllowsExpensiveNetworkAccess":null,"iosCachePolicy":null,"iosHttpShouldHandleCookies":null,"iosHttpShouldUsePipelining":null,"iosNetworkServiceType":null,"iosTimeoutInterval":null,"iosMainDocumentURL":null},"isForMainFrame":true,"androidHasGesture":true,"androidIsRedirect":false,"iosWKNavigationType":null,"iosSourceFrame":null,"iosTargetFrame":null}

To Do

• double check the original issue to confirm it is fully satisfied
• add testing notes and screenshots in PR description to help guide reviewers
• request the "UX" team perform a design review (if/when applicable)