float32 are now consistent default data types in factories

[Markus-Goetz]

Description

All factories, including random now use ht.float32 as default dtype.

Issue/s resolved: #491

Type of change

Remove irrelevant options:

• Bug fix (non-breaking change which fixes an issue)
• Documentation update

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 #526 into master will not change coverage by %.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #526   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files          68       68           
  Lines       14094    14094           
=======================================
  Hits        13615    13615           
  Misses        479      479           

Impacted Files	Coverage Δ
heat/core/random.py	100.00% <100.00%> (ø)
heat/core/tests/test_communication.py	97.20% <100.00%> (ø)
heat/core/tests/test_manipulations.py	99.29% <100.00%> (ø)
heat/core/tests/test_random.py	98.03% <100.00%> (ø)
heat/core/tests/test_statistics.py	99.30% <100.00%> (ø)
heat/regression/lasso/tests/test_lasso.py	94.11% <100.00%> (ø)

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