Add bidirectional messaging proc-macro-srv #21249
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Overall good code, left some comments.
@Veykril would you like to review this too?
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…pe and remove JsonNew
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This PR adds a bidirectional proc-macro protocol so the server can ask the client for data while expanding a macro . The approach is still synchronous and single-request-at-a-time. The server may emit sub-requests during expansion, the client replies immediately, and the server then finishes with the final response. All messages use the same request id, and stdin/stdout remain strictly ordered. Legacy protocols are untouched