Support for Thanos store time portioning ; extraEnv for all deployments

[levydori]

Q	A
Bug fix?	yes
New feature?	yes
API breaks?	no
Deprecations?	no
Related tickets	fixes #X, partially #Y, mentioned in #Z
License	Apache 2.0

What's in this PR?

• Adding support for store time portioning in the Thanos chart. Time portioning is a Thanos feature (https://thanos.io/components/store.md/#time-based-partioning) added to Thanos version 0.7.0 and higher
• Adding option to add extraEnv for all deployment (It was actually a bug - as the readme showed it can be added to store, but there was no way of doing it

Why?

On a large bucket, the store component requires a lot of memory to run, and may take a lot of time to start. Breaking stores to smaller partitions reduces the resources used per Pod.

Additional context

https://thanos.io/components/store.md/#time-based-partioning

Checklist

• User guide and development docs updated (if needed) - Chart readme update
• Related Helm chart(s) updated (if needed)

To Do

• Merge PR Support for Thanos v0.8.0 ; Adding query readiness probe and store readiness + health probes #948 first

[tarokkk]

It looks promising :) thank you. I had one question/comment regarding the example.

[levydori]

@tarokkk Thanks for the comments - fixed.