Fixes #110

Connection pools such as HikariCP return proxy statements that are not
instances of OracleCallableStatement, so fetching reporter output with a
pooled connection failed in DefaultOutputBuffer.getLinesCursorStatement.
The cast was never needed, because only standard CallableStatement
methods are used. It is replaced with a plain CallableStatement, the same
way CompatibilityOutputBufferPre310 already does it.

Also close the statement created in Reporter.initDbReporter. It was never
closed, so every Reporter.init leaked an open cursor. On long-lived
pooled connections this can lead to ORA-01000.

Add unit tests for both cases using mocked, non-Oracle JDBC objects.

…e in

a shared helper in AbstractOutputBuffer. The helper closes the statement
if binding fails, so it no longer leaks on that error path.

…on_cast

Fix ClassCastException with pooled connections in DefaultOutputBuffer

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… version on github.