Add docc file type support

[Jake-Prickett]

Resolves tuist/tuist#3650

Short description 📝

Adds support for including Docs.docc files.

Solution 📦

Inspected the project file to determine fileType for the new extension.

Implementation 👩‍💻👨‍💻

Add docc and file type to Xcode constants for the project.

[codecov-commenter]

Codecov Report

Merging #660 (4b69815) into main (8998757) will increase coverage by 0.08%.
The diff coverage is 90.24%.

@@            Coverage Diff             @@
##             main     #660      +/-   ##
==========================================
+ Coverage   84.66%   84.75%   +0.08%     
==========================================
  Files         154      157       +3     
  Lines        8878     8987     +109     
==========================================
+ Hits         7517     7617     +100     
- Misses       1361     1370       +9     

Impacted Files	Coverage Δ
Sources/XcodeProj/Project/Xcode.swift	100.00% <ø> (ø)
...ests/Objects/Project/PBXProjIntegrationTests.swift	100.00% <ø> (+1.29%)	⬆️
.../XcodeProj/Scheme/XCScheme+TestableReference.swift	72.88% <62.50%> (-1.63%)	⬇️
Sources/XcodeProj/Scheme/XCSchemeManagement.swift	87.69% <87.69%> (ø)
...s/XcodeProjTests/Extensions/XCTestCase+Shell.swift	92.85% <92.85%> (ø)
...codeProjTests/Scheme/XCSchemeManagementTests.swift	100.00% <100.00%> (ø)
Sources/XcodeProj/Utils/JSONDecoding.swift	72.58% <0.00%> (+3.22%)	⬆️

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[kwridan]

Thanks for adding this @Jake-Prickett

[pepicrft]

@all-contributors add @Jake-Prickett for code

[allcontributors]

@pepicrft

I've put up a pull request to add @Jake-Prickett! 🎉