Bug/795-reshape split none to new split

[ClaudiaComito]

Description

Issue/s resolved: #795

Changes proposed:

• reshape(a, shape, new_split) now returns a distributed DNDarray if new_split is not None even if a is not distributed
• update keyword argument for reshape() method to new_split from old axis
• allow shape elements to be passed in as separate arguments when calling the reshape() method
• replace unnecessary factories.array() calls with DNDarray() for a significant improvement in performance
• update tests

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

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 #796 (aa16095) into master (8e7b14d) will increase coverage by 0.01%.
The diff coverage is 92.85%.

@@            Coverage Diff             @@
##           master     #796      +/-   ##
==========================================
+ Coverage   95.28%   95.29%   +0.01%     
==========================================
  Files          64       64              
  Lines        8964     8972       +8     
==========================================
+ Hits         8541     8550       +9     
+ Misses        423      422       -1     

Flag	Coverage Δ
gpu	94.42% <92.85%> (+0.01%)	⬆️
unit	90.87% <92.85%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
heat/core/manipulations.py	99.07% <92.85%> (-0.18%)	⬇️
heat/core/dndarray.py	97.25% <0.00%> (+0.45%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8e7b14d...aa16095. Read the comment docs.