fix: importing AsyncSession from fastapi_sqla - DIA-46202

[hadrien]

Description

• As mentionned by @abnerjacobsen in Versions 2.5.0 or 2.4.0 not found in PyPi #66 (comment), importing async components (AsyncPaginate, AsyncPagination, and AsyncSession) fails.
• This is due to circular imports: fastapi_sqla.async_support tried to import things in fastapi_sqla while being loaded.
• This PR moves most of the sync related API components in fastapi_sqla.sqla to avoid circular imports;
• Regression test is in tests/test_import.py

Related JIRA issues

• DIA-46202

Related PRs

[codecov]

Codecov Report

Merging #68 (650187a) into master (4f02815) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #68   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         5    +1     
  Lines          370       375    +5     
  Branches        15        15           
=========================================
+ Hits           370       375    +5     

Flag	Coverage Δ
sqlalchemy1.3-asyncpg-aws_rds_iam	65.60% <87.42%> (+0.19%)	⬆️
sqlalchemy1.3-asyncpg-noaws_rds_iam	63.46% <87.42%> (+0.22%)	⬆️
sqlalchemy1.3-noasyncpg-aws_rds_iam	65.33% <87.42%> (+0.19%)	⬆️
sqlalchemy1.3-noasyncpg-noaws_rds_iam	63.20% <87.42%> (+0.22%)	⬆️
sqlalchemy1.4-asyncpg-aws_rds_iam	96.00% <96.85%> (-0.76%)	⬇️
sqlalchemy1.4-asyncpg-noaws_rds_iam	93.86% <96.85%> (-0.73%)	⬇️
sqlalchemy1.4-noasyncpg-aws_rds_iam	76.80% <96.22%> (-0.50%)	⬇️
sqlalchemy1.4-noasyncpg-noaws_rds_iam	74.66% <96.22%> (-0.47%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
fastapi_sqla/__init__.py	100.00% <100.00%> (ø)
fastapi_sqla/_pytest_plugin.py	100.00% <100.00%> (ø)
fastapi_sqla/asyncio_support.py	100.00% <100.00%> (ø)
fastapi_sqla/sqla.py	100.00% <100.00%> (ø)

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