685 ravel function + 696 reshape infer dimension

[mtar]

Description

This PR adds a ravel functionality to heat. It works mostly the same as flatten, but it uses shallow copies / views for the data when split=0.
Issue/s resolved: #685

Reshape infers the shape if one unknown dimension -1 is specified.
Issue/s resolved: #696

Changes proposed:

• add ravel function
• fix tests for flatten
• reshape with one unknown dimension

Type of change

• New feature

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

[codecov]

Codecov Report

Merging #690 (b511899) into master (442c271) will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #690      +/-   ##
==========================================
+ Coverage   95.82%   96.00%   +0.18%     
==========================================
  Files          63       63              
  Lines        8071     8091      +20     
==========================================
+ Hits         7734     7768      +34     
+ Misses        337      323      -14     

Flag	Coverage Δ
gpu	95.11% <100.00%> (+0.17%)	⬆️
unit	94.38% <100.00%> (+0.18%)	⬆️

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

Impacted Files	Coverage Δ
heat/core/dndarray.py	96.61% <100.00%> (+0.13%)	⬆️
heat/core/manipulations.py	99.24% <100.00%> (+0.01%)	⬆️
heat/core/stride_tricks.py	98.03% <100.00%> (ø)
heat/cluster/kmedians.py	96.07% <0.00%> (+25.49%)	⬆️

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[ClaudiaComito]

Hi @mtar, looks good! I only have some minor requests.

[coquelin77]

only a doc comment (missed function link) everything else looks good

All comments have been addressed