upgrade asio from 1.29.0 to 1.38.0 (#827)

Migrate removed deprecated APIs:
- io_service -> io_context
- io_service::work -> executor_work_guard
- resolver::query/iterator -> resolver::resolve() with results_type
- address::from_string() -> make_address()

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Breaking Changes (1.33.0)
  - deferred as default completion token — can omit token in coroutines: co_await socket.async_read_some(buf)
  - cancel_after / cancel_at — timeout any async operation: co_await sock.async_read_some(buf, cancel_after(5s))
  - Partial completion token adapters — as_tuple, redirect_error, bind_executor etc. composable via pipe: co_await (async_write(sock, buf) | as_tuple | cancel_after(10s))
  - composed — simpler alternative to async_compose for stateful operation implementations
  - co_composed moved out of experimental

  1.35.0 — Allocator & Resolver
  - Allocator constructors for io_context and thread_pool — control memory allocation for services, I/O objects, strands
  - Configurable resolver thread pool ("resolver"/"threads")
  - Timer heap pre-allocation ("timer"/"heap_reserve")

  1.37.0 — Inline Executors & Reactor Tuning
  - inline_executor — always executes inline (useful as completion executor)
  - inline_or_executor<> — tries inline first, falls back to wrapped executor
  - New dispatch/post/defer overloads that run a function on one executor and deliver result to a handler on another
  - redirect_disposition — captures disposition into a variable (like redirect_error but generic)
  - Reactor config: reset_edge_on_partial_read, use_eventfd, use_timerfd

  Notable Fixes

  - Resource leak in awaitable move assignment (1.37.0)
  - Memory leak in SSL stream move assignment (1.37.0)
  - Thread sanitizer issue in kqueue reactor (1.37.0)
  - co_spawn non-reentrant completion handler fix (1.36.0)
  - Windows file append mode fix (1.32.0)
  - SSL engine move assignment leak (1.33.0)

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