editoast: connection type alias

[Wadjetz]

part of #6980

• Add Connection type alias for AsyncPgConnection
• Add ConnectionPool type alias for diesel Pool
• Add ConnectionConfig type alias for AsyncDieselConnectionManager
• Refactor diesel pool creation fonction

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.29428% with 87 lines in your changes are missing coverage. Please review.

Project coverage is 29.11%. Comparing base (f72ba7f) to head (55b62fa).

Files	Patch %	Lines
editoast/src/modelsv2/connection_pool.rs	0.00%	26 Missing ⚠️
editoast/src/views/train_schedule/mod.rs	7.14%	13 Missing ⚠️
editoast/src/models/timetable.rs	30.00%	7 Missing ⚠️
editoast/src/views/v2/path/pathfinding.rs	0.00%	6 Missing ⚠️
editoast/src/views/v2/train_schedule.rs	53.84%	6 Missing ⚠️
editoast/src/models/mod.rs	25.00%	3 Missing ⚠️
editoast/src/views/timetable/import.rs	0.00%	3 Missing ⚠️
editoast/src/generated_data/error/mod.rs	71.42%	2 Missing ⚠️
editoast/src/modelsv2/infra.rs	87.50%	2 Missing ⚠️
editoast/src/views/rolling_stocks/mod.rs	87.50%	2 Missing ⚠️
... and 16 more

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Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #7336      +/-   ##
============================================
+ Coverage     29.09%   29.11%   +0.01%     
  Complexity     2020     2020              
============================================
  Files          1137     1138       +1     
  Lines        139647   139726      +79     
  Branches       2757     2757              
============================================
+ Hits          40635    40681      +46     
- Misses        97403    97436      +33     
  Partials       1609     1609              

Flag	Coverage Δ
core	76.76% <ø> (ø)
editoast	72.04% <76.29%> (-0.04%)	⬇️
front	9.34% <ø> (ø)
gateway	2.43% <ø> (ø)
railjson_generator	87.49% <ø> (ø)
tests	83.96% <ø> (ø)

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[hamz2a]

LGTM, thanks!

[leovalais]

I second @woshilapin's comment, otherwise lgtm thanks!