Make javadoc of codec package visible

Add package info for codec.lob package.

Author: mirromutth

pom.xml

@@ -241,7 +241,7 @@
                 <version>3.2.0</version>
                 <configuration>
                     <excludePackageNames>
-                        dev.miku.r2dbc.mysql.authentication,dev.miku.r2dbc.mysql.client,dev.miku.r2dbc.mysql.util,dev.miku.r2dbc.mysql.codec,dev.miku.r2dbc.mysql.message
+                        dev.miku.r2dbc.mysql.authentication,dev.miku.r2dbc.mysql.client,dev.miku.r2dbc.mysql.util,dev.miku.r2dbc.mysql.codec.lob,dev.miku.r2dbc.mysql.message
                     </excludePackageNames>
                     <links>
                         <link>https://projectreactor.io/docs/core/release/api/</link>

src/main/java/dev/miku/r2dbc/mysql/codec/lob/package-info.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018-2020 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
+ *
+ *      http://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.
+ */
+
+/**
+ * The support of LOB (Blob, Clob).
+ */
+
+@NonNullApi
+package dev.miku.r2dbc.mysql.codec.lob;
+
+import reactor.util.annotation.NonNullApi;