Async event signaling in zig

[@frisketdog]

Thanks!

[@sphaerophoria]

01:38:15 It's actually possible to fix this by just inverting the dependency order. E.g. instead of HttpConnection owning something that gives it responses to write, have a specific connection own an HttpConnection and forward polls to it. See github.com/sphaerophoria/ball-machine/blob/dcc4ec5b03435d00b190dfbfbff2be55195419eb/src/http_test.zig#L8 as an example (WIP commit, will probably get garbage collected at some point)

[@MrKeebs]

Thanks!