Add support for deprecated or windows fields

[jLopezbarb]

Signed-off-by: Javier López Barba javier@okteto.com

Fixes Adds support for windows scale field which is named cpu_count

Proposed changes

• As windows users can not user scale, they may have cpu_count field instead, so this PR makes it possible to use it
• Adds support for mem_limit, mem_reservation and cpus. Even that they are going to be deprecated, the composes that I found that manages memory and cpus still uses these fields

[codecov]

Codecov Report

Merging #1532 (c10406f) into master (622e706) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1532      +/-   ##
==========================================
+ Coverage   35.96%   36.06%   +0.09%     
==========================================
  Files          88       88              
  Lines        8405     8405              
==========================================
+ Hits         3023     3031       +8     
+ Misses       5015     5011       -4     
+ Partials      367      363       -4     

Impacted Files	Coverage Δ
pkg/model/stack_serializer.go	55.19% <100.00%> (+1.53%)	⬆️

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