Add rule to remove redundant Equatable implementations

Sources/OptionDescriptor.swift

@@ -1247,6 +1247,12 @@ struct _Descriptors {
         help: "Sort SwiftUI props: none, alphabetize, first-appearance-sort",
         keyPath: \.swiftUIPropertiesSortMode
     )
+    let equatableMacroInfo = OptionDescriptor(
+        argumentName: "equatablemacro",
+        displayName: "The name and module of an Equatable conformance macro",
+        help: "For example: \"@Equatable,EquatableMacroLib\"",
+        keyPath: \.equatableMacroInfo
+    )
 
     // MARK: - Internal