Add TimesFMModel

[egoriyaa]

Before submitting (must do checklist)

• Did you read the contribution guide?
• Did you update the docs? We use Numpy format for all the methods and classes.
• Did you write any new necessary tests?
• Did you update the CHANGELOG?

Proposed Changes

Closing issues

closes #528

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[d-a-bunin]

I think we should do:

nan_segments = nan_segment_mask.loc[:, nan_segment_mask].index.get_level_values("segment").unique().tolist()

[codecov]

Codecov Report

Attention: Patch coverage is 88.51508% with 99 lines in your changes missing coverage. Please review.

Project coverage is 90.42%. Comparing base (7fab7c7) to head (abdf5e1).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
etna/libs/timesfm/timesfm_base.py	78.82%	47 Missing ⚠️
etna/libs/timesfm/xreg_lib.py	83.57%	23 Missing ⚠️
etna/libs/timesfm/patched_decoder.py	94.66%	16 Missing ⚠️
etna/libs/timesfm/timesfm.py	86.30%	10 Missing ⚠️
etna/settings.py	71.42%	2 Missing ⚠️
etna/models/nn/timesfm.py	99.12%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #544      +/-   ##
==========================================
- Coverage   90.52%   90.42%   -0.10%     
==========================================
  Files         256      262       +6     
  Lines       17375    18234     +859     
==========================================
+ Hits        15728    16488     +760     
- Misses       1647     1746      +99     

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