Add GetDependencies functor

Sources/ElixxirDAppsSDK/GetDependencies.swift

+import Bindings
+import XCTestDynamicOverlay
+
+public struct GetDependencies {
+  public var run: () -> String
+
+  public func callAsFunction() -> String {
+    run()
+  }
+}
+
+extension GetDependencies {
+  public static let live = GetDependencies(run: BindingsGetDependencies)
+}
+
+extension GetDependencies {
+  public static let unimplemented = GetDependencies(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}

Sources/ElixxirDAppsSDK/Legacy/DependenciesProvider.swift

-import Bindings
-
-public struct DependenciesProvider {
-  public var get: () -> String
-
-  public func callAsFunction() -> String {
-    get()
-  }
-}
-
-extension DependenciesProvider {
-  public static let live = DependenciesProvider(get: BindingsGetDependencies)
-}
-
-#if DEBUG
-extension DependenciesProvider {
-  public static let failing = DependenciesProvider { fatalError("Not implemented") }
-}
-#endif