Add gRPC client-side and bidirectional streaming support

[ryanfowler]

Stream multiple JSON objects as individual gRPC frames using io.Pipe for incremental delivery. Detection is automatic via the proto schema's MethodDescriptor.IsStreamingClient(), requiring no new CLI flags.

[Copilot]

Pull request overview

This PR adds support for gRPC client-side and bidirectional streaming by enabling multiple JSON objects to be streamed as individual gRPC frames. The implementation uses io.Pipe for incremental delivery and automatically detects streaming methods via the proto schema's MethodDescriptor.IsStreamingClient().

Changes:

• Modified setupGRPC to detect and return whether a method is client-streaming
• Added streamGRPCRequest function to handle streaming multiple JSON objects as separate gRPC frames
• Updated request processing logic to handle client-streaming vs unary/server-streaming differently
• Added comprehensive test coverage for streaming scenarios
• Updated documentation to reflect streaming support

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/fetch/proto.go	Added streamGRPCRequest function and modified setupGRPC to detect client-streaming methods
internal/fetch/fetch.go	Updated request processing to handle client-streaming separately from unary calls
internal/fetch/proto_test.go	Added unit tests for streamGRPCRequest covering various input scenarios
integration/integration_test.go	Added integration tests for client-streaming gRPC with multiple test cases
docs/grpc.md	Updated documentation to describe client and bidirectional streaming support

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