Write ADR on CRD changes for UserInfoFetcher

[soenkeliebau]

No description provided.

[NickLarsenNZ]

An example of the CRD changes in action: https://github.com/stackabletech/opa-operator/blob/d28b17c78549dee4018879e0a701386927bdc424/tests/templates/kuttl/keycloak-user-info/10-install-opa.yaml.j2#L33C1-L45C34

[lfrancke]

Whoever picks this up needs to pick @soenkeliebau on what is actually required here and/or for more information.

[soenkeliebau]

Basically all I wanted to ensure with this issue is, that we capture the discussions that were had during the design phase for UIF.

I remember there were a lot of points around what needs to be configured, what doesn't etc.

If there were a couple of opinions on how the config might look I'd just like to capture them here. If I am mistaken and it was all consential from the beginnning this can be closed :)