UTBot Python updates

[tamarinvs19]

Description

• Supported recursive collections: list and dict, but without comparison because python raises RecursionError
• Supported regex patterns re.Pattern (here we can't use re.Pattern constructor, we should use re.compile)
• Fixed problems with rendering process for repr-objects include raw-strings
• Refactored ReduceValueProvider

How to test

Semi-automated tests

New test samples in samples/ directory

Self-check list

Check off the item if the statement is true. Hint: [x] is a marked item.

Please do not delete the list or its items.

• I've set the proper labels for my PR (at least, for category and component).
• PR title and description are clear and intelligible.
• I've added enough comments to my code, particularly in hard-to-understand areas.
• The functionality I've repaired, changed or added is covered with automated tests.
• Manual tests have been provided optionally.
• The documentation for the functionality I've been working on is up-to-date.