Add in_column to get_anomalies methods

[WinstonDovlatov]

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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?

Type of Change

• Examples / docs / tutorials / contributors update
• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Proposed Changes

Related Issue

#201

Closing issues

closes #177

[codecov-commenter]

Codecov Report

Merging #199 (24f888b) into master (4a0db38) will increase coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
+ Coverage   88.07%   88.32%   +0.24%     
==========================================
  Files          76       76              
  Lines        3523     3519       -4     
==========================================
+ Hits         3103     3108       +5     
+ Misses        420      411       -9     

Impacted Files	Coverage Δ
.../analysis/outliers/confidence_interval_outliers.py	86.95% <ø> (ø)
etna/analysis/outliers/sequence_outliers.py	96.55% <ø> (ø)
etna/analysis/outliers/density_outliers.py	97.72% <100.00%> (ø)
etna/analysis/outliers/hist_outliers.py	77.07% <100.00%> (+5.73%)	⬆️
etna/analysis/outliers/median_outliers.py	95.83% <100.00%> (ø)
etna/transforms/outliers.py	98.78% <100.00%> (-0.06%)	⬇️

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