This is part 2 of #53. ## Already implemented before * AdapterScript: already in builder * OracleTable: already in builder ## Implemented in PR https://github.com/exasol/test-db-builder-java/pull/116 * VirtualSchema: moved writing to builder * Table: moved writing to builder ## Todo * ConnectionDefinition * ExasolSchema * ExasolUser * MySqlSchema * MySqlUser * OracleSchema * OracleUser * PostgreSqlSchema * PostgreSqlUser