Checks if the Weaver.Editor.Procedural.Scripting.ElementBuilder.Name of this member matches the name of the `existingMember`.

Overrides of this method should check other factors to ensure that the existing member matches this builder (such as field type and access modifiers) and if so, cache the member so it can be returned by Weaver.Editor.Procedural.Scripting.MemberBuilder.ExistingMember.

public override bool IsExistingMember(MemberInfo existingMember, ref bool shouldRebuild)