implement isfinite isinf isnan

[mtar]

Description

Issue/s resolved: #710

Changes proposed:

• new features: isfinite, isinf, isnan

Type of change

• 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 #711 (7987449) into master (379aae9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #711   +/-   ##
=======================================
  Coverage   94.40%   94.40%           
=======================================
  Files          51       51           
  Lines        7447     7453    +6     
=======================================
+ Hits         7030     7036    +6     
  Misses        417      417           

Flag	Coverage Δ
unit	94.40% <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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