PackageFingerprint: make some of the private API more public

This extends the visibility of some of the private implementation to the
package level to allow use for testing without `@testable` imports.

Author: compnerd

Sources/PackageFingerprint/FilePackageFingerprintStorage.swift

@@ -20,7 +20,7 @@ import struct TSCUtility.Version
 
 public struct FilePackageFingerprintStorage: PackageFingerprintStorage {
     let fileSystem: FileSystem
-    let directoryPath: Basics.AbsolutePath
+    package let directoryPath: Basics.AbsolutePath
 
     private let encoder: JSONEncoder
     private let decoder: JSONDecoder
@@ -350,13 +350,13 @@ protocol FingerprintReference {
 }
 
 extension PackageIdentity: FingerprintReference {
-    var fingerprintsFilename: String {
+    package var fingerprintsFilename: String {
         "\(self.description).json"
     }
 }
 
 extension PackageReference: FingerprintReference {
-    var fingerprintsFilename: String {
+    package var fingerprintsFilename: String {
         get throws {
             guard case .remoteSourceControl(let sourceControlURL) = self.kind else {
                 throw StringError("Package kind [\(self.kind)] does not support fingerprints")