[FEATURE] Create formula and build

[kaduartur]

- What I did

• Add the new template for build formula inside Windows named build.bat
• Create packages inside the formula package to organize it
• Add omitempty to Command and Formula struct
• Add validation when RepoUrl does not exist in tree.json

- How to verify it
Run tests and run the command rit create formula to check it

[codecov-commenter]

Codecov Report

Merging #212 into master will increase coverage by 1.48%.
The diff coverage is 73.26%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
+ Coverage   64.55%   66.03%   +1.48%     
==========================================
  Files          86       72      -14     
  Lines        4319     2706    -1613     
==========================================
- Hits         2788     1787    -1001     
+ Misses       1144      662     -482     
+ Partials      387      257     -130     

Impacted Files	Coverage Δ
pkg/cmd/add_repo.go	50.00% <ø> (-3.25%)	⬇️
pkg/cmd/build_formula.go	0.00% <0.00%> (ø)
pkg/formula/create_builder.go	0.00% <0.00%> (ø)
pkg/formula/runner/docker_pre_runner.go	55.55% <33.33%> (ø)
pkg/formula/builder/build.go	77.02% <58.33%> (-7.67%)	⬇️
pkg/cmd/create_formula.go	54.83% <58.94%> (-3.72%)	⬇️
pkg/formula/runner/post_run.go	46.15% <60.00%> (ø)
pkg/formula/formula.go	66.66% <63.63%> (-17.30%)	⬇️
pkg/formula/creator/lang.go	69.86% <69.86%> (ø)
pkg/formula/runner/default_setup.go	65.33% <70.37%> (ø)
... and 29 more

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[kaduartur]

/merge qa

[ritchie-bot]

👌 Merged branch feature/create_and_build_formula into qa

[kaduartur]

/merge qa

[ritchie-bot]

👌 Merged branch feature/create_and_build_formula into qa

[kaduartur]

/merge qa

[ritchie-bot]

👌 Merged branch feature/create_and_build_formula into qa

[kaduartur]

/merge qa

[ritchie-bot]

👌 Merged branch feature/create_and_build_formula into qa