feat: Begin working on configuration client.

Sources/ConfigurationClient/ConfigurationFile.swift

@@ -0,0 +1,58 @@
+import Dependencies
+import FileClient
+import Foundation
+
+public enum ConfigruationFile: Equatable, Sendable {
+  case json(URL)
+  case toml(URL)
+
+  public init?(url: URL) {
+    if url.pathExtension == "toml" {
+      self = .toml(url)
+    } else if url.pathExtension == "json" {
+      self = .json(url)
+    } else {
+      return nil
+    }
+  }
+
+  var url: URL {
+    switch self {
+    case let .json(url): return url
+    case let .toml(url): return url
+    }
+  }
+}
+
+extension ConfigruationFile {
+
+  func load() async throws -> Configuration? {
+    @Dependency(\.coders) var coders
+    @Dependency(\.fileClient) var fileClient
+
+    switch self {
+    case .json:
+      let data = try await Data(fileClient.read(url.cleanFilePath).utf8)
+      return try? coders.jsonDecoder().decode(Configuration.self, from: data)
+    case .toml:
+      let string = try await fileClient.read(url.cleanFilePath)
+      return try? coders.tomlDecoder().decode(Configuration.self, from: string)
+    }
+  }
+
+  func write(_ configuration: Configuration) async throws {
+    @Dependency(\.coders) var coders
+    @Dependency(\.fileClient) var fileClient
+
+    let data: Data
+
+    switch self {
+    case .json:
+      data = try coders.jsonEncoder().encode(configuration)
+    case .toml:
+      data = try Data(coders.tomlEncoder().encode(configuration).utf8)
+    }
+
+    try await fileClient.write(data, url)
+  }
+}