add new tools to compute how much cloud units is used by a workload

[zaibon]

Description

Add a new consumption section in j.tools.zos which allow to compute how much cloud units are consumed by a workload object

Changes

• Add new module in j.tools.zos
• Add resource_units methods on all the workloads model

Related Issues

fixes #1423

Checklist

• Tests included
• Build pass
• Documentation
• Code format and docstrings

[codecov-io]

Codecov Report

Merging #1492 (b2752aa) into development (2b67ab3) will increase coverage by 0.20%.
The diff coverage is 78.12%.

@@               Coverage Diff               @@
##           development    #1492      +/-   ##
===============================================
+ Coverage        32.15%   32.35%   +0.20%     
===============================================
  Files              134      134              
  Lines            12754    12822      +68     
===============================================
+ Hits              4101     4149      +48     
- Misses            8653     8673      +20     

Impacted Files	Coverage Δ
jumpscale/clients/explorer/models.py	96.42% <78.12%> (-3.06%)	⬇️
...scale/packages/threebot_deployer/chats/threebot.py	21.66% <0.00%> (-0.12%)	⬇️
jumpscale/sals/marketplace/deployer.py	12.53% <0.00%> (-0.04%)	⬇️

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[LeeSmet]

I don't really like the idea of giving 50GB of SSD for containers for free, but it is what it is I guess

[LeeSmet]

lgtm