✨ Add async support starting with aiopg

[zschumacher]

• Add a CommandsAsync interface
• Support coroutines as context manager for CommandsAsync
• Add support for aiopg
• Refactor tests to be easier to work with and more modular
• Add docs for connecting via async and aiopg specifically

contributes to #19

[codecov-commenter]

Codecov Report

Merging #22 (2b01e09) into main (7fae9e6) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              main       #22    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           16        17     +1     
  Lines          367       532   +165     
  Branches        59        87    +28     
==========================================
+ Hits           367       532   +165     

Flag	Coverage Δ
3.10	99.81% <99.49%> (-0.19%)	⬇️
3.7	100.00% <100.00%> (ø)
3.8	100.00% <100.00%> (ø)
3.9	100.00% <100.00%> (ø)

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Impacted Files	Coverage Δ
pydapper/dsn_parser.py	100.00% <ø> (ø)
pydapper/__init__.py	100.00% <100.00%> (ø)
pydapper/commands.py	100.00% <100.00%> (ø)
pydapper/main.py	100.00% <100.00%> (ø)
pydapper/postgresql/__init__.py	100.00% <100.00%> (ø)
pydapper/postgresql/aiopg.py	100.00% <100.00%> (ø)
pydapper/utils.py	100.00% <100.00%> (ø)

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