feat(py): allow passing binary body to the data parameter

[barjin]

Following the discussion under #97 , this PR widens the type accepted by the data parameter.

data now accepts both a dict[str,str] and a binary representation of the request body. This PR intentionally doesn't update the recently added typings in the impit.pyi file, as this behaviour (accepting the binary body) is considered deprecated in the httpx library we use as the design master.

[Copilot]

Pull Request Overview

This PR widens the accepted type for the data parameter in HTTP requests, enabling binary data to be sent alongside form-encoded data. Key changes include:

• New tests (both sync and async) that verify passing a binary (or JSON string) body via the data parameter.
• Introduction of a new Rust enum (RequestBody) to handle different data types.
• Updating function signatures in multiple modules to accept RequestBody instead of a dictionary.

Reviewed Changes

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

Show a summary per file

File	Description
impit-python/test/basic_test.py	Added test for passing string body as binary data
impit-python/test/async_test.py	Added async test for passing binary body via data
impit-python/src/request.rs	Introduced RequestBody enum and form_to_bytes helper function
impit-python/src/lib.rs	Updated impit function signature to accept RequestBody for data
impit-python/src/client.rs	Updated Client methods to accept RequestBody for data
impit-python/src/async_client.rs	Updated AsyncClient methods to accept RequestBody for data

[Copilot]

Pull Request Overview

This PR updates the API to allow passing a binary body to the data parameter while maintaining support for form data. Key changes include:

• Adding new tests (both synchronous and asynchronous) for binary and non-ASCII input.
• Introducing a new RequestBody enum in Rust with variants for bytes, form, and catch‐all.
• Updating function signatures and internal request handling logic in multiple modules to use RequestBody.

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
impit-python/test/basic_test.py	Added tests for binary request body and form data with non-ASCII.
impit-python/test/async_test.py	Added async tests for binary body and non-ASCII form data.
impit-python/src/request.rs	Introduced RequestBody enum and form_to_bytes helper function.
impit-python/src/lib.rs	Updated function signature to accept RequestBody instead of HashMap.
impit-python/src/client.rs	Revised request functions to handle RequestBody and convert form data.
impit-python/src/async_client.rs	Revised async request functions to handle RequestBody consistently.
impit-python/Cargo.toml	Added dependency for urlencoding.

Comments suppressed due to low confidence (1)

impit-python/test/basic_test.py:90

• [nitpick] The trailing underscore in 'test_form_non_ascii_' may be confusing; consider renaming the function to 'test_form_non_ascii' for clarity.

def test_form_non_ascii_(self, browser: Browser) -> None:

[Copilot]

Using panic on an unsupported data type may lead to abrupt crashes in production; consider returning an error instead to allow for graceful handling.

Suggested change

	panic!("Unsupported data type in request body: {:#?}", e)
	return Err(format!("Unsupported data type in request body: {:#?}", e))