Strip Struct Metadata

In https://github.com/dwyl/auth/blob/cbeedace69af42acb604137c5b5a5acbac6a58f1/lib/auth/role.ex#L172-L176 we wrote a function to strip `Struct` metadata. I find myself needing it again in the work I'm doing today.
So going to pull it out to here ...

Start by reading lib/auth/role.ex at lines 172-176 in the linked dwyl/auth revision to understand the existing Struct-metadata stripping function. Then inspect this repository's utility organization and test conventions before determining where the reusable function belongs. Done means the behavior is available here without duplicating the original implementation and is covered by the repository's tests.

Written by the indexing model from the issue text.