add unary negative / positive + fix deg2rad / rad2deg

[mtar]

Description

implement unary positive and negative operations + fix deg2rad / rad2deg

Issue/s resolved: #763

Changes proposed:

• add unary +
• add unary -
• deg2rad: replace with pytorch function
• rad2deg: replace with pytorch function
• add documentation for alias functions in arithmetics.py

Type of change

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

[codecov]

Codecov Report

Merging #768 (f018a3a) into master (fb1e4fd) will increase coverage by 0.01%.
The diff coverage is 95.45%.

@@            Coverage Diff             @@
##           master     #768      +/-   ##
==========================================
+ Coverage   95.22%   95.23%   +0.01%     
==========================================
  Files          64       64              
  Lines        8728     8739      +11     
==========================================
+ Hits         8311     8323      +12     
+ Misses        417      416       -1     

Flag	Coverage Δ
gpu	94.33% <95.45%> (+0.01%)	⬆️
unit	90.70% <95.45%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
heat/core/arithmetics.py	99.05% <95.00%> (-0.43%)	⬇️
heat/core/trigonometrics.py	100.00% <100.00%> (+2.66%)	⬆️

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