Run the Help comm on the R thread#1284
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Branched from #1283
Progress towards #689 and #691
See #1075 for context: we're moving comms out of their own threads to run on the R thread, to simplify the concurrency structure of Ark and remove the risk of concurrent R evaluations which are UB (although these are now also tackled under a different angle, see #1222).
The help comm no longer has its own thread and event loop. Instead it implements
CommHandlerand its handlers get run on the R thread.Like the UI comm, it's a pinned comm that is accessible via methods on Console, so it uses the patterns established in Simplify ownership of the list of comms #1283.
New kernel-level integration test for the Help comm (progress towards Migrate existing comm tests to protocol-level tests #1074).