Support h2 database

hippo4j-server/src/main/resources/application-h2.properties

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+spring.datasource.driver-class-name=org.h2.Driver
+spring.datasource.url=jdbc:h2:mem:hippo4j_manager;DB_CLOSE_DELAY=-1;MODE=MySQL;
+spring.datasource.username=sa
+spring.datasource.password=sa
+spring.datasource.schema=classpath:sql-script/h2/hippo4j_manager.sql
+

hippo4j-server/src/main/resources/application-mysql.properties

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+### Data source customization section
+spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
+spring.datasource.url=jdbc:mysql://localhost:3306/hippo4j_manager?characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true&serverTimezone=GMT%2B8
+spring.datasource.username=root
+spring.datasource.password=123456