DATACOUCH-675 - Factor out interfaces for common methods. (#293)

Added interfaces for apis on core objects which are common among
many objects. For instance withExpiry and withExpirty on all the
insert/replace/upsert/remove objects.  The definition of an interface
simplyfies testing of all the possible combinations - instead of having
four (or eight, counting Reactive), there is one interface to test
them all.

Co-authored-by: mikereiche <michael.reiche@couchbase.com>

src/test/java/org/springframework/data/couchbase/domain/UserAnnotated2.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2020 the original author or authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.data.couchbase.domain;
+
+import java.util.concurrent.TimeUnit;
+
+import org.springframework.data.couchbase.core.mapping.Document;
+
+/**
+ * Annotated User entity for tests
+ *
+ * @author Michael Reiche
+ */
+
+@Document(expiryExpression = "${myExpiryExpression}", expiryUnit = TimeUnit.SECONDS)
+public class UserAnnotated2 extends User {
+	static {
+		System.setProperty("myExpiryExpression", "2");
+	}
+
+	public UserAnnotated2(String id, String firstname, String lastname) {
+		super(id, firstname, lastname);
+	}
+}