[Feat]: Add a demo of MyBatis working with OceanBase. #79

Job	Run time
basic (mybatis, java, true) / ci	1m 31s
basic (mysql-connector-python, python, true) / ci	1m 27s
basic (go-sql-driver, golang, true) / ci	1m 39s
basic (mysql-connector-java, java, true) / ci	1m 34s
basic (oceanbase-client, java, true) / ci	1m 37s
basic (mybatis-plus, java, false) / ci	1m 44s
basic (pymysql, python, true) / ci	1m 28s
basic (testcontainers-java, java, false) / ci	1m 30s
	12m 30s

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