Resolve "Enable Istio peer authentication for mimir"

General MR

Summary

• Added PeerAuth for Mimir
• Added minimum required networkpolicies for successful deployment with ISTIO

Relevant logs/screenshots

(Include any relevant logs/screenshots)

Linked Issue

#11 (closed)

Upgrade Notices

(Include any relevant notes about upgrades here or write "N/A" if there are none)

Closes #11 (closed)