[BD-24][TNL-7919] LTI Advantage Names and Roles provisioning service implementation direction (#142)

* Add wip ADR about NRPS

* Nit

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Address nits

* Write a bit more

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Update docs/decisions/0004-lti-advantage-nrps.rst

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

* Nits

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>