SKIP UPGRADE Add Thanos to BB Chart

Package Merge Request

Thanos into BigBang.

Package Changes

This MR adds values and additional configuration for Thanos into the BB umbrella chart.

• Values
• Schema
• Templates

Package MR

https://repo1.dso.mil/big-bang/apps/sandbox/thanos

For Issue

Closes #1651 (closed)

Closes #1795 (closed)

Closes #1792 (closed)

Closes #1791 (closed)