2.24.0

#308 Implement toString methods to make debug easy
#307 Polish the org.seasar.doma.internal package
#306 Remove Japanese comments
#305 Register the option "doma.config.path" to suppress a warning message
#304 Simplify the DefaultPropertyType class
#303 Simplify generators
#301 Fix compile error in procedure and function methods
#300 Support bound type parameters in domain classes
#299 Migrate from JUnit 3 to JUnit 5
#298 Polish build script