Feature Request: Add Armor powerups

[mcphedar]

Is your feature request related to a problem? Please describe. Powerups were part of the original design, but were never implemented. Add powerup that spawn in random places within the level and that respawn during the round.

Describe the solution you'd like

• Armor powerup makes players immune to damage for a short while after pickup

VFX and audio exist for both of these assets.

(stretch) Add a shader or similar effect that plays on players who are under the effect of the armor power up. The shader should be visible from a distance.

The pulsing body shield here is a great example - https://youtu.be/1I8zN2e1l2g?t=160

Describe alternatives you've considered None

Additional context None

[lmbr-pip]

Split Speedup pickups to own feature here: https://github.com/o3de/o3de-multiplayersample/issues/319