API: Rename keepdim kwarg to keepdims

[neosunhan]

Description

Renames keepdim kwarg to keepdims, in accordance with the numpy API.

Affected functions:

• prod
• sum
• all
• any
• max
• median
• min
• percentile
• vecdot
• logsumexp

Issue/s resolved: #1006

Changes proposed:

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• 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

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[codecov]

Codecov Report

Merging #1008 (6b8a18f) into main (cb46e2c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1008   +/-   ##
=======================================
  Coverage   91.77%   91.77%           
=======================================
  Files          72       72           
  Lines       10485    10485           
=======================================
  Hits         9623     9623           
  Misses        862      862           

Flag	Coverage Δ
unit	91.77% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
heat/cluster/_kcluster.py	90.09% <100.00%> (ø)
heat/cluster/kmeans.py	97.05% <100.00%> (ø)
heat/cluster/kmedians.py	71.69% <100.00%> (ø)
heat/cluster/kmedoids.py	76.92% <100.00%> (ø)
heat/core/_operations.py	96.04% <100.00%> (ø)
heat/core/arithmetics.py	98.59% <100.00%> (ø)
heat/core/linalg/basics.py	95.44% <100.00%> (ø)
heat/core/logical.py	100.00% <100.00%> (ø)
heat/core/statistics.py	96.88% <100.00%> (ø)
heat/naive_bayes/gaussianNB.py	93.58% <100.00%> (ø)

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[github-actions]

Thank you for the PR!

[ClaudiaComito]

@neosunhan @mtar I'm done here. I've renamed keepdim in Heat reduce operations as well, which called for more refactoring in a number of modules.

Thanks again @neosunhan for the great work!