Remove unused code

[mzitnik]

Remove deprecated ru.yandex package & update LICENCE file

[zhicwu]

We can create a separate PR in the future to merge some of the tests from legacy code

[hantaoliulinux]

Hello, I would like to ask, the code to switch from ru.yandex. to com.clickhouse, like this ssl, socketTimeout set, after the switch should how to set?
ClickHouseProperties clickHouseProperties = new ClickHouseProperties();
clickHouseProperties.setSocketTimeout(60000);
clickHouseProperties.setSsl(true);
clickHouseProperties.setSslMode("none");