Add use cases for creating and destroying mute rules

lib/use_case/mute_rule/create.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module UseCase
+  module MuteRule
+    class Create < UseCase::Base
+      option :user, type: Types.Instance(::User)
+      option :phrase, type: Types::Coercible::String
+
+      def call
+        rule = ::MuteRule.create(
+          user:,
+          muted_phrase: phrase
+        )
+
+        {
+          status:   201,
+          resource: rule
+        }
+      end
+    end
+  end
+end

lib/use_case/mute_rule/destroy.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module UseCase
+  module MuteRule
+    class Destroy < UseCase::Base
+      option :rule, Types.Instance(::MuteRule)
+
+      def call
+        rule.destroy!
+
+        {
+          status:   204,
+          resource: nil
+        }
+      end
+    end
+  end
+end