add v8 to ci (#76)

* add v8 to ci

* updated remaining dependencies

* fix integration tests for later Exasol DB versions : Register the JDBC driver for ExaLoader

* add specific tests for all new failing 'unsolved' v8 shared integration tests

* Fixes for
- time scalar functions: add cast to decimal
- division: add cast to double precision before divide

* use driver manager to upload and register driver

* fix exasol error code to correct VS

* shorten switch

* refactoring for readability

.gitattributes

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