adds alter table changeset apply and sql, adds AS to attribute mapping

...in/kotlin/unibz.cs.semint.kprime/domain/dml/AlterTable.kt

...ain/kotlin/unibz.cs.semint.kprime/domain/dml/ChangeSet.kt

....cs.semint.kprime/usecase/common/ApplyChangeSetUseCase.kt

...bz.cs.semint.kprime/usecase/common/SQLizeCreateUseCase.kt

...bz.cs.semint.kprime/usecase/common/SQLizeSelectUseCase.kt

src/test/kotlin/unibz.cs.semint.kprime/domain/MappingTest.kt