LookupHandler is now a Generic abstract base class

[ITProKyle]

Summary

runway.lookups.handlers.base.LookupHandler is now a Generic ABC (abstract base class).

Why This Is Needed

• classes that inherit from abc.ABC can require methods to be defined by subclasses at runtime beyond just raising NotImplimentedError
  • also verified by type checkers/linters
• typing.Generic can be used to improve type checking

What Changed

Changed

• runway.lookups.handlers.base.LookupHandler is now an ABC (abstract base class)
  • handle method is now decorated with abstractmethod to ensure it is defined by subclasses beyond just raising NotImplimentedError
• runway.lookups.handlers.base.LookupHandler is now a Generic
• updated all lookups to reflect the changes to LookupHandler
• updated documentation to reflect the changes to LookupHandler

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.17%. Comparing base (9961015) to head (fd4a8c9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2524   +/-   ##
=======================================
  Coverage   90.17%   90.17%           
=======================================
  Files         256      256           
  Lines       15650    15651    +1     
=======================================
+ Hits        14112    14114    +2     
+ Misses       1538     1537    -1     

Files	Coverage Δ
runway/cfngin/lookups/handlers/ami.py	100.00% <100.00%> (ø)
runway/cfngin/lookups/handlers/awslambda.py	93.54% <100.00%> (+0.84%)	⬆️
runway/cfngin/lookups/handlers/default.py	100.00% <100.00%> (ø)
runway/cfngin/lookups/handlers/dynamodb.py	100.00% <100.00%> (ø)
runway/cfngin/lookups/handlers/envvar.py	100.00% <100.00%> (ø)
runway/cfngin/lookups/handlers/file.py	100.00% <100.00%> (ø)
runway/cfngin/lookups/handlers/hook_data.py	100.00% <100.00%> (ø)
runway/cfngin/lookups/handlers/kms.py	96.29% <100.00%> (ø)
runway/cfngin/lookups/handlers/output.py	96.42% <100.00%> (ø)
runway/cfngin/lookups/handlers/rxref.py	100.00% <100.00%> (ø)
... and 12 more

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