add normal, standard_normal

[mtar]

Description

Convenient function to draw samples from a generic normal distribution.

Issue/s resolved: #855

Changes proposed:

• normal
• standard_normal

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 #858 (2e406e2) into master (45d4a00) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #858   +/-   ##
=======================================
  Coverage   95.45%   95.46%           
=======================================
  Files          64       64           
  Lines        9382     9396   +14     
=======================================
+ Hits         8956     8970   +14     
  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/random.py	99.66% <100.00%> (+0.01%)	⬆️

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