Remove @_implementationOnly imports. (#33)

Author: mbrandonw

Sources/MacroTesting/AssertMacro.swift

@@ -10,9 +10,7 @@ import SwiftSyntaxMacros
 import XCTest
 
 #if canImport(Testing)
-  // NB: We are importing only the implementation of Testing because that framework is not available
-  //     in Xcode UI test targets.
-  @_implementationOnly import Testing
+  import Testing
 #endif
 
 /// Asserts that a given Swift source string matches an expected string with all macros expanded.

Sources/MacroTesting/Internal/RecordIssue.swift

@@ -1,9 +1,7 @@
 import XCTest
 
 #if canImport(Testing)
-  // NB: We are importing only the implementation of Testing because that framework is not available
-  //     in Xcode UI test targets.
-  @_implementationOnly import Testing
+  import Testing
 #endif
 
 @_spi(Internals)

Sources/MacroTesting/MacrosTestTrait.swift

@@ -2,9 +2,7 @@
   import SnapshotTesting
   import SwiftSyntax
   import SwiftSyntaxMacros
-  // NB: We are importing only the implementation of Testing because that framework is not available
-  //     in Xcode UI test targets.
-  @_implementationOnly import Testing
+  import Testing
 
   @_spi(Experimental)
   extension Trait where Self == _MacrosTestTrait {