Implementation of batch predict

[MikalaiB]

Add possibility to execute batch predict for group of files.
Refer to Jetbrains plugin.

As user I wish to select multiple files in package view
And execute Elitea: Predict
And select required prompt
Then output files have to be added in specified directory within the workspace.

TO do:

• enable prediction on package / selection level
• add new property related to output (folder where output should be added) with defaul value .prediction-output
• file processing has to to be file-by-file