Feature Request: Hud element for # of gems remaining

[mcphedar]

Is your feature request related to a problem? Please describe. It can be hard to know how many gems remain to be collected, especially in later rounds.

Describe the solution you'd like Add a simple hud element that denotes the number of remaining gems in the level

Describe alternatives you've considered None

Additional context None

[lmbr-pip]

Potential overlap with https://github.com/o3de/o3de-multiplayersample/issues/281