Add OAuth support

[aleh-yurevich-if]

Hello!

Do you have any plans to introduce OAuth identity provider as one of the way to login to FileMaker?

[fuzzzerd]

Currently do not have any plans to implement OAuth functionality, but I would definitely consider accepting a pull request.

[fuzzzerd]

Support for FileMaker Cloud was added, and since this issue hasn't had any activity in quite some time I'm going to close it. If you find this and want to submit a PR, I'd be glad to review but this isn't something I will be focusing on implementing.