Add a gRPC implementation choice: libgrpc - #83
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Wire the `libgrpc` value of `-Dgrpc-provider` to a real transport backed by Google's libgrpc, through the `cgrpc_wrapper` Zig bindings (a lazy dependency, so default builds never fetch it nor the libgrpc sources). The transport performs a raw unary call with the pre-encoded protobuf payload, maps non-OK statuses to retryable/non-retryable errors per the OTLP spec, and builds channel credentials from the shared `grpc/config.zig` decision. Reading PEM files needs an `Io`, so `send` takes one; the noop backend and the `otlp.Export` call site are updated accordingly. Assisted-by: Claude Opus 5
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Closes #13
Wire the
libgrpcvalue of-Dgrpc-providerto a real transport backed by Google's libgrpc, through thecgrpc_wrapperZig bindings (a lazy dependency, so default builds never fetch it nor the libgrpc sources).The transport performs a raw unary call with the pre-encoded protobuf payload, maps non-OK statuses to retryable/non-retryable errors per the OTLP spec, and builds channel credentials from the shared
grpc/config.zigdecision.Reading PEM files needs an
Io, sosendtakes one; the noop backend and theotlp.Exportcall site are updated accordingly.Split and adapted from zig-o11y/opentelemetry-sdk#140
Remaining: