[BML-34]Train annif models on bill committees chronological dataset

[BorodaUA]

Hi 👋 team, please review changes that I made in scope of following task(s):

• [BML-34]Train annif models on bill committees chronological dataset

Here what is done:

• Added poetry
• Created notebook with training\eval data for chronological split (108-116 congresses train and 117-118 test splits)