Features/556 assign label

[Inzlinger]

Description

Implements the K-Nearest-Niehgbour Algorithm.
Maybe wait with merge until #601 is fixed.

Type of change

• New feature (non-breaking change which adds functionality)

Due Diligence

• [ x] All split configurations tested
• [ x] Multiple dtypes tested in relevant functions
• [ x] Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[codecov]

Codecov Report

Merging #620 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #620   +/-   ##
=======================================
  Coverage   97.49%   97.49%           
=======================================
  Files          77       77           
  Lines       15869    15869           
=======================================
  Hits        15472    15472           
  Misses        397      397           

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[Markus-Goetz]

Remove the required.

Please check the capitalization of words (start of sentence, nouns lower case).

[Markus-Goetz]

The required are still in

[Markus-Goetz]

One tiny thin still

[Markus-Goetz]

Bump, please remove the required comments from the docstrings and add this PR to the Changelog