Correct/wrong answer pattern finder

[vvchernov]

Create script(s) which will parse json file with queries/predictions for certainty = 0 and automatically create answer pattern.

1. To create pattern it is needed to convert answer to general view using request metadata ({answer}, {distractor} and so on).
2. Add counter to pattern to follow its frequency.
3. Show only predefined number of patterns

[vvchernov]

See PR for details

[vvchernov]

Hello @pa-shk!
Some meeting minutes:

1. Find answer templates depended on question template
2. For task "starts_with_word" filter answers in which specified word is the second one and the first one is article ("a", "the")
3. Analyze and add new question/answer templates.