Add support for LTI Dynamic Registration

[michaelwheeler]

Spec available at https://www.imsglobal.org/spec/lti-dr/v1p0

Defines a way to automate the exchange of registration information between platforms and tools that use the OpenId Connect and oAuth 2 registration flows, allowing platform administrators to automate tool registrations and avoid tedious and possibly error prone manual configuration while remaining in control of granting or denying tools access to the platform.

[michaelwheeler]

An article from Unicon describing how dynamic registration works.

[michaelwheeler]

Work happening upstream at dmitry-viskov/pylti1.3#114

[cmurtaugh]

I built out a (very rough) implementation of Dynamic Registration for a django-lti sample app that we have. I avoided using pylti1p3 functionality since it's not clear whether changes will ever be merged there. Here's a Gist with a clip of the relevant code: https://gist.github.com/cmurtaugh/6a08cc2d3c717e2570ce7ca47d2ba9aa

[michaelwheeler]

Here's a Gist with a clip of the relevant code: https://gist.github.com/cmurtaugh/6a08cc2d3c717e2570ce7ca47d2ba9aa

Thanks for sharing @cmurtaugh. Really excited to check this out!