NativeType and ColumnType names should matches.

For now, column types names contains their sizes like ColumnType.INT8, ColumnType.INT16 and so on, to abstract from the platform Ignite can be used on (via thin-clients).

But we use Java-specific notation for internal types: NativeType.BYTE, NativeType.LONG.

Let's rename NativeTypes to easily match them to/from column type.