Tiles to sep class

[coquelin77]

Description

Removal of the tiling object from the DNDarray

Issue/s resolved: N/A

Changes proposed:

• removal of tiling object from DNDarray
• minor changes to calls of QR
• doc updates

Type of change

Remove irrelevant options:

• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
  breaking changes have been addressed in codebase
• 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?

yes, qr functions

[codecov]

Codecov Report

Merging #531 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #531      +/-   ##
==========================================
- Coverage   96.28%   96.28%   -0.01%     
==========================================
  Files          75       75              
  Lines       14540    14533       -7     
==========================================
- Hits        14000    13993       -7     
  Misses        540      540              

Impacted Files	Coverage Δ
heat/core/linalg/basics.py	93.65% <ø> (ø)
heat/core/dndarray.py	96.52% <100.00%> (-0.04%)	⬇️
heat/core/linalg/qr.py	99.29% <100.00%> (ø)
heat/core/tests/test_tiling.py	98.10% <100.00%> (-0.01%)	⬇️
heat/core/tiling.py	96.28% <100.00%> (ø)

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