New version to work with 'common' statements

[schreiberx]

This is an alternative version to work with 'common' statements.
Here, common statements are directly supported in the symbol table rather than using workarounds.

[codecov]

Codecov Report

❌ Patch coverage is 96.03175% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.94%. Comparing base (5f5004c) to head (58d0bef).

Files with missing lines	Patch %	Lines
src/psyclone/psyir/symbols/symbol_table.py	87.17%	5 Missing ⚠️
src/psyclone/psyir/symbols/symbol.py	81.81%	4 Missing ⚠️
src/psyclone/psyir/symbols/interfaces.py	95.00%	1 Missing ⚠️

❌ Your project check has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3444      +/-   ##
==========================================
- Coverage   99.96%   99.94%   -0.02%     
==========================================
  Files         391      392       +1     
  Lines       54689    54898     +209     
==========================================
+ Hits        54670    54870     +200     
- Misses         19       28       +9     

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