(Closes #913) move 'colored' util from psyir.nodes to psyclone.utils

[haanahfrost]

Moves the 'colored' utility out of psyir/nodes/nodes.py into psyclone/utils.py

• psyir/nodes/node.py: removed the definition and the #913 TODO; now imports colored from psyclone.utils for its single call site in coloured_name(). Removed from __all__.
• psyir/nodes/__init__.py: removed the re-export and the __all__ entry
• Updated the imports in 28 test files

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (3dd19f4) to head (c256e3f).
⚠️ Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3578   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          399       399           
  Lines        56173     56188   +15     
=========================================
+ Hits         56173     56188   +15     

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