add ffi & c++ wrapper for reactor and executor #48280
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clintjedwards
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serra-fastly
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This adds a C++ API for working with Reactor and Executor.
The plan is to allow proxy and handler to work with these objects so that they may run their EventLoop as a Future within an Executor. This will make proxy and handler evented execution consistent with how connmgr works (i.e. always through an Executor), and will allow running other Futures concurrent with the EventLoop in the same thread. The EventLoop implementation already supports being run as a Future (via
EventLoop::exec_async()), so getting this to work is mostly a matter of exposing the needed pieces to C++.To start out, this PR adds an initial API to allow constructing Reactor and Executor from C++, as well as running the Executor.