Enhance HolidaysTransform

[alex-hse-repository]

🚀 Feature Request

HolidaysTransform should make it possible to distinct between the holidays

Motivation

Make work with country holidays more flexible

Proposal

Add parameter mode which has two possible values:

• binary: we have a binary column which represents the presense of the holiday.
• category: we have a categorical column which represents which holiday do we have at each day. A special value is used for days without holiday.

Test cases

1. Fix tests to check that both modes are working correctly.
2. Check that inference tests at tests/test_transforms/test_inference are working correctly

Alternatives

No response

Additional context

No response

Checklist

• I discussed this issue with ETNA Team