Add initial `ProjectNamespaceMember`
What does this MR do and why?
As a first step of Consolidate Group and Project member management (&7054 - closed), create the empty class ProjectNamespaceMember, which inherits directly from ProjectMember.
We will be building on top of this.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #349572 (closed)
Edited by Brett Walker