Non-negative sample size for linspace/logspace

[neosunhan]

Description

Allow linspace to be called with 0 sample size. This also fixes an inconsistency with the documentation, which already allows num to be non-negative.

Issue/s resolved: #994

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

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Legend

[codecov]

Codecov Report

Merging #995 (2dfd591) into main (05a2acd) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #995      +/-   ##
==========================================
- Coverage   91.12%   91.10%   -0.03%     
==========================================
  Files          65       65              
  Lines        9976     9976              
==========================================
- Hits         9091     9089       -2     
- Misses        885      887       +2     

Flag	Coverage Δ
gpu	?
unit	91.10% <100.00%> (ø)

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Impacted Files	Coverage Δ
heat/core/factories.py	99.24% <100.00%> (ø)
heat/core/tests/test_suites/basic_test.py	91.26% <0.00%> (-1.95%)	⬇️

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