Move graph and bean validation to utils
- Moved graph database initialization and validation to GraphUtils.java.
- Moved bean validation functions to BeanUtils.java.
- Made functions accessible without class initialization.
- Made all Utils classes final with a private empty constructor (no subclassing, no instantiation).
- Moved sub-command specific graph validation to cli for validation package.
- Made input parameters in variation package buissiness logic classes immutable.
Edited by Robin van Esch