feat: Breaking out more dependencies.

Sources/ConfigurationClient/File.swift

@@ -0,0 +1,53 @@
+import Foundation
+
+/// Represents a file location and type on disk for a configuration file.
+public enum File: Equatable, Sendable {
+
+  case json(URL)
+  case toml(URL)
+
+  public init?(_ url: URL) {
+    if url.cleanFilePath.hasSuffix("json") {
+      self = .json(url)
+    } else if url.cleanFilePath.hasSuffix("toml") {
+      self = .toml(url)
+    } else {
+      return nil
+    }
+  }
+
+  public init?(_ path: String) {
+    self.init(URL(filePath: path))
+  }
+
+  public static func json(_ path: String) -> Self {
+    .json(URL(filePath: path))
+  }
+
+  public static func toml(_ path: String) -> Self {
+    .toml(URL(filePath: path))
+  }
+
+  public var url: URL {
+    switch self {
+    case let .json(url): return url
+    case let .toml(url): return url
+    }
+  }
+
+  public var path: String {
+    url.cleanFilePath
+  }
+
+  public static var `default`: Self {
+    .toml("~/.config/\(HPAKey.configDirName)/\(HPAKey.defaultFileName)")
+  }
+}
+
+@_spi(Internal)
+public extension URL {
+
+  var cleanFilePath: String {
+    absoluteString.replacing("file://", with: "")
+  }
+}