Refactor for envs vars, labels and annotations

[jLopezbarb]

Fixes #1415

Proposed changes

• Now these three fields works in the same way when unmarshalling them.
• They can accept map and list syntax.
• When unmarshalling you can use env vars as key or value

[codecov]

Codecov Report

Merging #1444 (1922a02) into master (b64902f) will increase coverage by 0.26%.
The diff coverage is 68.75%.

@@            Coverage Diff             @@
##           master    #1444      +/-   ##
==========================================
+ Coverage   36.24%   36.51%   +0.26%     
==========================================
  Files          79       79              
  Lines        7261     7276      +15     
==========================================
+ Hits         2632     2657      +25     
+ Misses       4301     4287      -14     
- Partials      328      332       +4     

Impacted Files	Coverage Δ
pkg/k8s/deployments/crud.go	23.11% <0.00%> (ø)
pkg/k8s/services/translate.go	0.00% <0.00%> (ø)
pkg/model/stack.go	41.12% <0.00%> (ø)
pkg/model/translation.go	0.00% <ø> (ø)
pkg/model/dev.go	56.45% <60.00%> (ø)
pkg/model/serializer.go	63.49% <73.68%> (+1.34%)	⬆️
pkg/cmd/stack/translate.go	84.74% <100.00%> (ø)
pkg/model/stack_serializer.go	39.27% <100.00%> (+1.47%)	⬆️

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[pchico83]

Suggested change

	Environment Environments `json:"environment,omitempty" yaml:"environment,omitempty"`
	Environment Environment `json:"environment,omitempty" yaml:"environment,omitempty"`