frontends (tools/aio): add tool to run from thread, run maybe async method, or run GLib loop: - `run_from_thread` can be used to run a method from a thread. - `maybe_async` can be used to run a method if we are not sure if it's async or not. - `install_glib_asyncio_iteration` run the GLib loop from asyncio one's. rel 426

You'll find install instructions in documentation (see doc/installation.rst).

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