Introduce number predicates

[avegera]

Acceptance

Implementation of the following common number predicates should be added (place in the same Predicates.java class):

• isGreaterThan
• isGreaterThanOrEqualTo
• isLessThan
• isLessThanOrEqualTo
• isBetween
• notBetween
• isOdd
• isEven

Initial support of the following expression builder should be added:

where().number(Product::price).isGreaterThan(100);

All object predicates from #1 should be inherited:

where().number(Product::price).isEqualTo(someNumber);
where().number(Product::price).isNull();
where().number(Product::price).notNull();
...