Take both a list of strings and comma separated string in get_roles #6600
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LTI1.1 provides a comma separated list of roles while LTI1.3 provides a list.
The launch LTIParams provides an abstraction for this, always returning the LTI1.1 version.
To allow using get_roles outside a launch context without having to needlessly convert between the two formats allow the method to take roles in both formats.