Implement ExceptionConverterDriver in Oracle drivers

Fix parsing SQL Server bracket delimiters in SQL statements

Add missing driver exception subclasses

Fix Oracle test suite

[DBAL-558] Fix parsing parameters in quoted text with backslash

[DBAL-234] [DBAL-566] Add support for renaming indexes

Fix full qualified table name schema introspection

Fix table alteration on Drizzle

[DBAL-472] Fix altering column from notnull to null in Oracle

Fix dropping table without autoincrement trigger in Oracle

[DBAL-553] Add support for native JSON type on capable platforms

Connection: Replaced ! is_int with is_string

[DBAL-685] Add servicename connection parameter to Oracle drivers

Fix foreign key columns order in Oracle

Fix column default value introspection in Oracle

Fix foreign key propagation on non-supporting MySQL table engines

[DBAL-552] Fix parsing backtick quoted statement fragments in SQLParserUtils

Fix index flags

Intended side effect is not to call extractTypeValues when $types array is empty which it is by default.