grpc-protobuf: add server codegen utils - #2818
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This change introduces the types required for server codegen (see this branch for the full set of changes).
Additionally, this PR mvoes the
ServerStatusfrom thegrpccrate to thegrpc-protobufcrate.ServerStatuswraps the standard status type to prevent users from accidentally forwarding client errors from a server handler using the?operator.Finally, this change re-exports the
async_traitmacro from thegrpccrate (similar totonic). Becauseasync traitimplementations require#[async_trait], re-exporting it avoids requiring applications to addasync-traitas a direct dependency in theirCargo.tomlwhile using the generated code.