Add mybatis-generator-plugin module (#46)

* Add mybatis-generator-plugin module

* add module in pom

* spotless

* add example

* update version

* iotdb-spring-boot-starter

* rat

* rat +1

* rat +1

* remove chinese comment

* update README.md

* update example table name

* alignment IoTDB

* add package in distribution/

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Co-authored-by: 2b3c511 <rong.li@timecho.com>