Add operator examples in lesson 7

[kab163]

https://github.com/LLNL/raja-suite-tutorial/tree/main/Intro_Tutorial/lessons/06_raja_umpire_uvm

Add an example of using copy or move operators to make Rich happy.

[kab163]

Edit - we already show copy in lesson 7, so maybe show move...

"Fill it out a bit more" - Rich

Add an example of Umpire's realloc, memset, etc. operators here too, not just copy.