Change entity propery type to generic type

so that no external serializer is needed for rest service

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>
Add PostgresJdbcTemplate and PostgresSimpleJdbcCall

1. PostgresJdbcTemplate is a custom template with datasource which
removes the 'v_' prifix from the query output parameters
2. PostgresSimpleJdbcCall is a custom SimpleJdbcCall which map the
Result Set to POJOs

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>
Add crud rest operations to entities

Signed-off-by: walteryang <walteryang47@users.noreply.github.com>