enable streaming with multiple file types

[drahnr]

Obsoletes #418 #609

Closes #518

CC @JMendyk

[drahnr]

Could someone take a quick look and allow the workflow? Thanks!

[Copilot]

Pull request overview

This PR adds initial multipart/form-data request body support to the Progenitor generator and client runtime, along with new fixtures and golden outputs to validate generated code for multipart request bodies.

Changes:

• Add multipart/form-data as a recognized body content type and generate request-building code that uses a multipart form builder.
• Introduce FormPart/BinaryFormPart/TextFormPart (plus Filename and ContentType newtypes) in progenitor-client and a RequestBuilderExt::form_from_parts() helper.
• Add a sample OpenAPI spec and extensive generator tests/golden outputs covering mixed multipart field types and encodings.

Reviewed changes

Copilot reviewed 17 out of 18 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
sample_openapi/example_multipart.json	Adds a minimal multipart OpenAPI fixture used by output verification.
progenitor-impl/tests/test_specific.rs	Adds multipart-focused generator tests (including edge cases).
progenitor-impl/tests/test_output.rs	Adds output verification for the new multipart fixture.
progenitor-impl/tests/output/src/example_multipart_positional.rs	New golden output for positional client generation for multipart example.
progenitor-impl/tests/output/src/example_multipart_httpmock.rs	New golden output for httpmock helpers for multipart example.
progenitor-impl/tests/output/src/example_multipart_cli.rs	New golden output for CLI generation for multipart example.
progenitor-impl/tests/output/src/example_multipart_builder.rs	New golden output for builder-style client generation for multipart example.
progenitor-impl/tests/output/src/example_multipart_builder_tagged.rs	New golden output for tagged builder-style generation for multipart example.
progenitor-impl/src/method.rs	Adds FormData body type + a Form(TypeId) parameter type and emits .form_from_parts(...) for multipart bodies.
progenitor-impl/src/lib.rs	Adds generator state for form metadata and generates as_form() impls for multipart form structs.
progenitor-impl/src/httpmock.rs	Updates httpmock wrapper generation to account for form parameters.
progenitor-impl/src/cli.rs	Updates CLI generation to handle OperationParameterType::Form for body type lookup.
progenitor-client/tests/client_test.rs	Adds unit tests for new multipart form part APIs and newtypes.
progenitor-client/src/progenitor_client.rs	Implements multipart form part types/newtypes and RequestBuilderExt::form_from_parts().
progenitor-client/Cargo.toml	Adds assert_matches as a dev-dependency for new tests.
Cargo.toml	Enables reqwest multipart feature; adds assert_matches; enables tokio macros feature.
Cargo.lock	Updates lockfile for new dependencies/features.
cargo-progenitor/src/main.rs	Updates generated dependency snippet to include reqwest multipart feature.

Comments suppressed due to low confidence (1)

progenitor-impl/src/httpmock.rs:235

• httpmock wrapper generation treats multipart/form-data bodies the same as JSON bodies (json_body_obj). This will not match actual multipart requests and makes the generated httpmock helpers misleading for operations whose body is multipart/form-data.

For multipart bodies, consider not generating a body matcher by default (or matching only on headers), and let callers add custom matching behavior if they need it.

                    OperationParameterKind::Body(body_content_type) => match typ {
                        OperationParameterType::Type(_) | OperationParameterType::Form(_) => (
                            true,
                            quote! {
                                Self(self.0.json_body_obj(value))
                            },
                        ),

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