Allow keys and indexes to use properties on non-collection complex types

[AndriySvyryd]

Split off from #13947

Depends on #31236

Related to #11336

[ldeluigi]

Waiting for this

[danilo73r]

me too, very important

[hanzllcc]

Is it can be included in 9.0.0 release?

[arm-grigoryan]

Waiting for this feature !!!

[ajcvickers]

This issue is in the Backlog milestone. This means that it is not planned for the next release (EF Core 9.0). We will re-assess the backlog following the this release and consider this item at that time. However, keep in mind that there are many other high priority features with which it will be competing for resources. Make sure to vote (👍) for this issue if it is important to you.