Provide automl interface which infers task type

[PGijsbers]

Add a function which receives input data and based on that constructs a gama object.

Currently GAMA supports two task types: regression and classification in offline setting.
There is currently work for adding an online setting and in the future we can expect more task types (e.g. clustering, semi-supervised). The way the user currently specifies the task is through manually importing/instantiating the corresponding gama object. With a unified function we can instead infer the task type and return the right object automatically (of course explicitly specifying the task type should remain possible).