fix: raise Python exception on response body read error

[barjin]

Originally, Python Impit bindings would return a response with an empty body on a body read error. This didn't make much sense and caused issues in the downstream dependencies. Now we rethrow the error so it can be properly handled.

Closes apify/apify-sdk-python#672

[Copilot]

Pull Request Overview

This PR fixes the Python bindings to properly raise exceptions when response body read errors occur, instead of silently returning empty bodies. The key change is making the ImpitPyResponse::from_async method return a Result and propagating errors from the bytes() call.

Key Changes

• Modified error handling infrastructure to support optional context information when errors occur without full request context
• Changed ImpitPyResponse::from_async to return Result<Self, ImpitError> and propagate body read errors
• Updated both sync and async client implementations to properly handle and convert the new error type

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
impit/src/errors.rs	Made ErrorContext fields optional and updated ImpitError::from to accept Option to support error creation without full context
impit/src/impit.rs	Updated ErrorContext construction to wrap fields in Some() to match the new optional field structure
impit-python/src/response.rs	Changed from_async to return Result and propagate errors from bytes() call instead of defaulting to empty body
impit-python/src/client.rs	Updated error handling to properly convert ImpitError from from_async into ImpitPyError
impit-python/src/async_client.rs	Updated error handling to properly convert ImpitError from from_async into PyErr
impit-python/Cargo.toml	Added "auto-initialize" feature to pyo3 dependency
impit-python/uv.lock	Bumped version from 0.8.0 to 0.9.0

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