Improve Testing Setup

[PSchmiedmayer]

Improve Testing Setup

💡 Proposed solution

• Improves the testing setup to add a separate testing scheme and using Xcode test plans.

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[codecov]

Codecov Report

Merging #7 (69adb7f) into main (b8d52b3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines            3         4    +1     
=========================================
+ Hits             3         4    +1     

Impacted Files	Coverage Δ
Sources/TemplatePackage/TemplatePackage.swift	100.00% <100.00%> (ø)

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