feat: support native asyncpg connection pools #1182
                
     Merged
            
            
          
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As of
asyncpg v0.30.0, asyncpg native connection pools now supporta creation function (callable) via its
connectargument, similar toSQLAlchemy's
async_creatorargument to generate connections.Adding integration test and usage samples to README.
Also bumping asyncpg min supported version in
setup.pyto0.30.0to force supported version for this feature.
Closes #1180