Support Scheme shared flag

[dangthaison91]

Continue from PR #336

Short description 📝

Previously, Scheme will always generated as Shared Scheme despite of shared is set to false.

Solution 📦

If Scheme is shared, Xcode will generate xcscheme file in folder xcshareddata/xcschemes while scheme is not shared, it will be put in `xcuserdata/user_name.xcuserdatad/xcschemes

As @kwridan share about NSUsername(), we can use this function for appending write path for local scheme.

Implementation 👩‍💻👨‍💻

• Update function create scheme directory
• Update tests and fixture

[tuistbot]

	1 Warning
⚠️	Have you introduced any user-facing changes? If so, please take some time to update the documentation. Keeping the documentation up to date makes it easier for users to learn how to use Tuist.

Generated by 🚫 Danger

[kwridan]

👍

[pepicrft]

Nicely handled @dangthaison91

[dangthaison91]

Should we Squash and Merge @pepibumur

[codecov]

Codecov Report

Merging #341 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   90.81%   90.79%   -0.03%     
==========================================
  Files         281      281              
  Lines       13224    13150      -74     
==========================================
- Hits        12009    11939      -70     
+ Misses       1215     1211       -4

Impacted Files	Coverage Δ
...neratorTests/Generator/ProjectGeneratorTests.swift	99.18% <100%> (+0.22%)	⬆️
...es/TuistGenerator/Generator/SchemesGenerator.swift	99.61% <100%> (ø)	⬆️
Sources/TuistGenerator/Graph/Graph.swift	91.22% <0%> (-0.44%)	⬇️
...tKitTests/Generator/GeneratorModelLoaderTest.swift	98.4% <0%> (-0.02%)	⬇️
...rces/TuistKit/Generator/GeneratorModelLoader.swift	91.63% <0%> (+0.22%)	⬆️

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[pepicrft]

Yes @dangthaison91. I was going to do it but it's your honour 😛