docs: Add Flank output research docs

[piotradamczyk5]

Fixes #1555

Please check flank_output_propositon.md for new output proposition.
flank_current_output.md and gcloud_current_output.md are added for comparsion

Checklist

• Current Flank output
• Current Gcloud output
• Proposition

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[github-actions]

Timestamp: 2021-03-05 13:34:07
Buildscan url for ubuntu-workflow run 624550702
https://gradle.com/s/cez5uir5gggi2

[pawelpasterz]

How about iOS output? It's a bit different from android (in the context of flank).
Also, smart flank output -- are we going to change it somehow?

[jan-goral]

The links in the description doesn't work

[jan-goral]

The links are displaying too often, most of them are redundant and look too verbose. IMO when it comes to the bucket, only the link to the root is important. About firebase, the detailed link could be useful only when tests will finish with some issues, otherwise, we only need one link per matrix.

[piotradamczyk5]

The links in the description doesn't work

fixed

[piotradamczyk5]

How about iOS output? It's a bit different from android (in the context of flank).
Also, smart flank output -- are we going to change it somehow?

For a simple scenario outside output will be similar.
In another not simple cases it should be aligned during implementation