Create checker in contact and not in contact for string boundaries

...z/fgbks/base/utils/boundary/checker/CheckStringEqual.java

...bks/base/utils/boundary/checker/CheckStringInContact.java

...ks/base/utils/boundary/checker/CheckStringNotContact.java

...oblenz/fgbks/base/utils/boundary/impl/StringBoundary.java

...ase/utils/boundary/checker/AbstractStringCheckerTest.java

...base/utils/boundary/checker/CheckStringInContactTest.java

...e/utils/boundary/checker/CheckStringNotInContactTest.java