implement vecdot

[mtar]

Description

Implement vecdot, which allows row-wise/column-wise vector dot of matrices.

Issue/s resolved: #838

Changes proposed:

• add vecdot

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"

[codecov]

Codecov Report

Merging #840 (cd6881a) into master (f0afedf) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #840   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
=======================================
  Files          64       64           
  Lines        9125     9130    +5     
=======================================
+ Hits         8701     8706    +5     
  Misses        424      424           

Flag	Coverage Δ
gpu	94.50% <100.00%> (+<0.01%)	⬆️
unit	91.00% <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	94.39% <100.00%> (+0.04%)	⬆️

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