👌 IMPROVE: Specify abstract methods on Transport

[chrisjsewell]

Replace raise NotImplementedError with proper @abc.abstractmethod decorators

[codecov]

Codecov Report

Merging #5242 (abf315b) into develop (eb73c7d) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #5242      +/-   ##
===========================================
+ Coverage    81.31%   81.38%   +0.07%     
===========================================
  Files          529      529              
  Lines        37031    37008      -23     
===========================================
+ Hits         30109    30116       +7     
+ Misses        6922     6892      -30     

Flag	Coverage Δ
django	76.85% <100.00%> (+0.05%)	⬆️
sqlalchemy	75.83% <100.00%> (+0.07%)	⬆️

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Impacted Files	Coverage Δ
aiida/transports/transport.py	78.29% <100.00%> (+11.77%)	⬆️
aiida/transports/plugins/local.py	81.41% <0.00%> (-0.25%)	⬇️

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