add signbit

[mtar]

Description

Implementation of signbit

Issue/s resolved: #861

Changes proposed:

• signbit

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 #862 (37eae3d) into master (631f113) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #862   +/-   ##
=======================================
  Coverage   95.46%   95.46%           
=======================================
  Files          64       64           
  Lines        9396     9398    +2     
=======================================
+ Hits         8970     8972    +2     
  Misses        426      426           

Flag	Coverage Δ
gpu	94.63% <100.00%> (+<0.01%)	⬆️
unit	91.24% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
heat/core/logical.py	100.00% <100.00%> (ø)

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