async: add stdexec coroutine primitives + gRPC coroutine reply path#323
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Phase 0 of the stack-wide folly/std::future -> exec::task migration. All additive (existing std::future paths untouched), so consumers can adopt incrementally. - async/value_awaitable.hpp: cross-thread single-shot awaitable carrying T (generalizes cqe_awaitable from int->T). Producer complete(T) from any thread, consumer co_awaits; same lock-free init/waiting/done acq_rel handshake that restores folly::Future's cross-thread happens-before. - async/task.hpp: `using task = exec::task<T>` currency alias (opt-in header; needs stdexec). - async/when_all.hpp: dynamic (runtime-vector) fan-out when_all(vector<task<T>>) -> task<vector<T>>. Counting latch on value_awaitable; errors-as-values, never short-circuits (broadcast semantics ignore per-peer errors). T must be default-constructible. - grpc/rpc_client: GenericRpcDataCoroBlob + GenericAsyncStub::call_unary_co deliver a coroutine reply ALONGSIDE the std::future one (value_awaitable.complete fires from the gRPC CQ worker thread). Stays stdexec-free; when_all composition lives a layer up at nuraft_mesg. Test: test_value_awaitable (8/8, incl 2000-iter cross-thread handshake, registered unconditionally -- no stdexec needed).
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using task = exec::task<T>currency alias (opt-in header; needs stdexec).