New generation methods - implementation and visualization

[kasnerz]

Add other methods to generate text from the table except for a seq2seq model.

The methods may include:

• represeting cells as text using simple templates,
• deriving information from the table using rules or more advanced methods (sums, averages, trends, ...),
• generating relevant information from the table using a QG + QA model,
• retrieving additional information from external sources.

The goal is to examine all possible ways to generate the content present in table caption and find which methods are applicable (or if the task of generating table caption is possible at all).

The methods should be launchable on-demand from the app and visualizable alongside the tables.