Enhancement: Slim down minimum required dependencies
Summary
Ideally we want the base litestar package to have as few dependencies as possible. Right now we install a lot of extra packages that aren't actually needed for the core functionality.
These fall roughly into two groups: Speedups and additional features.
Speedups include:
fast-query-parsers(#2394)multidict
Additional features:
pyyamlto support exporting the OpenAPI schema as YAMLhttpxfor theTestClientpolyfactoryto generate OpenAPI examples (#2390)
Libraries required for Litestar to work
anyiomsgspec
The goal would be to exclude everything that's not strictly necessary from the base install and make it available through package extras, which could be included in the standard extra as well. This is a common practice and is used by packages like uvicorn, starlette and fastapi.
The plan is to work on these without breaking anything, and removing the packages as required dependencies once we hit 3.0.
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