[DX] Add config->getData() to match config->setData()

Description of the need I know that $config->get() -- with no parameters passed -- gets all the data from a config file, but every time I'm using config->setData() I always first type config->getData() when attempting to retrieve the data. It doesn't ever work, and I always have to look it up.

Proposed solution Can we add $config->getData() even just as a wrapper function to $config->get() for consistency?