feat: new_lifespan to allow configuring sqla engine directly

[hadrien]

Problem

• We cannot configure connect_args with environment variables
• Fixes Enabling Non-Legacy SQLite Transactional Modes #24

Solution

• add new_lifespan to allow passing sqla engine parameters directly:

  from fastapi import FastAPI
  from fastsqla import new_lifespan
  
  lifespan = new_lifespan(
      "sqlite+aiosqlite:///app/db.sqlite"), connect_args={"autocommit": False}
  )
  
  app = FastAPI(lifespan=lifespan)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (3be5771) to head (794d8bc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #25   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          100       108    +8     
  Branches         6         7    +1     
=========================================
+ Hits           100       108    +8     

Flag	Coverage Δ
default	100.00% <100.00%> (ø)
sqlmodel	98.14% <100.00%> (+0.14%)	⬆️

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[hadrien]

@vicrep What do you think? thanks!

[vicrep]

This is great, thanks for doing this @hadrien !

I liked the 12-factor-style-config being the default recommended approach, but for some specific setups, and nested config args (eg. that reported issue), the ergonomics of doing it fully through environ were at times lacking.

[hyperknot]

Super nice, thank you for the quick fix!