Update player data (skill level) after game ends

[markmandel]

After a game session is complete the Game Server will send a REST request to Profile Management service to update skill level.

The most interesting challenge is how the service discovery.

Summarising some chat we had on an internal doc to track.

• We could use an internal load balancer, and pass around the IP
• We could use ASM, but would need to to add the labels for sidecar injection into the gameserver and profile service pods and then configure ingress into the profile service

cc @kennycoder , @benfogel , @ggiovanejr to make sure I summarised this right.