feat: Begin working on configuration client.

Sources/ConfigurationClient/Coders.swift

@@ -0,0 +1,38 @@
+import Dependencies
+import DependenciesMacros
+import Foundation
+import TOMLKit
+
+public extension DependencyValues {
+  var coders: Coders {
+    get { self[Coders.self] }
+    set { self[Coders.self] = newValue }
+  }
+}
+
+@DependencyClient
+public struct Coders: Sendable {
+  public var jsonDecoder: @Sendable () -> JSONDecoder = { .init() }
+  public var jsonEncoder: @Sendable () -> JSONEncoder = { .init() }
+  public var tomlDecoder: @Sendable () -> TOMLDecoder = { .init() }
+  public var tomlEncoder: @Sendable () -> TOMLEncoder = { .init() }
+}
+
+extension Coders: DependencyKey {
+  public static var testValue: Coders {
+    .init(
+      jsonDecoder: { .init() },
+      jsonEncoder: { defaultJsonEncoder },
+      tomlDecoder: { .init() },
+      tomlEncoder: { .init() }
+    )
+  }
+
+  public static var liveValue: Coders { .testValue }
+
+  private static let defaultJsonEncoder: JSONEncoder = {
+    let encoder = JSONEncoder()
+    encoder.outputFormatting = [.prettyPrinted, .sortedKeys]
+    return encoder
+  }()
+}