Feature/mean_reciprocal_rank

[groundmax]

Добавил расчет метрики Mean Reciprocal Rank
По скорости / памяти не замерял, может и есть пути лучше. Если есть предложения по оптимизации, то готов выслушать :)

В некоторых расчетах метрик убрал сортировку в группировке и убрал еще некоторые неточности по ходу, которые замечал.

[codecov]

Codecov Report

Merging #29 (2eb3e83) into main (82351c2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #29   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           33        41    +8     
  Lines         2031      2119   +88     
=========================================
+ Hits          2031      2119   +88     

Impacted Files	Coverage Δ
rectools/metrics/__init__.py	100.00% <100.00%> (ø)
rectools/metrics/ranking.py	100.00% <100.00%> (ø)
rectools/tools/__init__.py	100.00% <0.00%> (ø)
rectools/utils/__init__.py	100.00% <0.00%> (ø)
rectools/models/__init__.py	100.00% <0.00%> (ø)
rectools/model_selection/__init__.py	100.00% <0.00%> (ø)
rectools/models/utils.py	100.00% <0.00%> (ø)
rectools/__init__.py	100.00% <0.00%> (ø)
rectools/dataset/__init__.py	100.00% <0.00%> (ø)

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[feldlime]

Great pull request

[sharthZ23]

Nice, lets merge