Dot product matrix vector ops + randn inf bugfix

[coquelin77]

Description

dot can multiply matrices and vectors now
randn bug is now hopefully fixed. tested up to memory limit of my personal machine

Issue/s resolved: #817 #819

Changes proposed:

• dot uses matmul to handle matrix @ vector inputs
• inputs to kundu transform in randn get a very small offset to move them away from 0. this should avoid the inf values from showing up without changing the distribution very much at all

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 #820 (5e84bd0) into master (83ec24a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #820   +/-   ##
=======================================
  Coverage   95.31%   95.31%           
=======================================
  Files          64       64           
  Lines        9000     9002    +2     
=======================================
+ Hits         8578     8580    +2     
  Misses        422      422           

Flag	Coverage Δ
gpu	94.44% <100.00%> (+<0.01%)	⬆️
unit	90.90% <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/linalg/basics.py	94.35% <100.00%> (ø)
heat/core/random.py	99.64% <100.00%> (+<0.01%)	⬆️

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[coquelin77]

@mtar approved this before there was a merge conflict in the changelog. I will merge this now