feat: Adding more helpers, wip

Sources/ComposableSubscriber/OnFailAction.swift

@@ -0,0 +1,30 @@
+import ComposableArchitecture
+import Foundation
+import OSLog
+
+public enum OnFailAction<State, Action> {
+  case fail(prefix: String? = nil, log: ((String) -> Void)? = nil)
+  case handle((inout State, Error) -> Void)
+
+  @available(macOS 11.0, iOS 14.0, watchOS 7.0, tvOS 14.0, *)
+  @inlinable
+  static func fail(prefix: String? = nil, logger: Logger) -> Self {
+    .fail(prefix: prefix, log: { logger.error("\($0)") })
+  }
+
+  @usableFromInline
+  func callAsFunction(state: inout State, error: Error) -> Effect<Action> {
+    switch self {
+    case let .fail(prefix, log):
+      if let prefix {
+        return .fail(prefix: prefix, error: error, log: log)
+      } else {
+        return .fail(error: error, log: log)
+      }
+    case let .handle(handler):
+      handler(&state, error)
+      return .none
+    }
+  }
+
+}