Add precompile statements to improve TTFW (Time-To-First-Worker)

Before:
```julia-repl
julia> @time addprocs(1)
  4.592567 seconds (6.56 M allocations: 328.356 MiB, 1.24% gc time, 89.93% compilation time)
1-element Vector{Int64}:
 2

julia> @time addprocs(1)
  3.466125 seconds (25.68 k allocations: 1.455 MiB, 1.12% compilation time)
1-element Vector{Int64}:
 3
```

After:
```julia-repl
julia> @time addprocs(1)
  3.204588 seconds (3.09 M allocations: 154.957 MiB, 1.04% gc time, 71.17% compilation time)
1-element Vector{Int64}:
 2

julia> @time addprocs(1)
  1.932320 seconds (25.67 k allocations: 1.454 MiB, 2.07% compilation time)
1-element Vector{Int64}:
 3
```

Could probably be improved in the future. A tricky part is running SnoopCompile
inside the worker to get inference results.

Author: JamesWrigley

src/precompile.jl

@@ -1,6 +1,19 @@
 precompile(Tuple{typeof(DistributedNext.remotecall),Function,Int,Module,Vararg{Any, 100}})
 precompile(Tuple{typeof(DistributedNext.procs)})
 precompile(Tuple{typeof(DistributedNext.finalize_ref), DistributedNext.Future})
+precompile(Tuple{typeof(DistributedNext.setup_launched_worker), DistributedNext.LocalManager, DistributedNext.WorkerConfig, Vector{Int}})
+precompile(Tuple{typeof(DistributedNext.process_tcp_streams), Sockets.TCPSocket, Sockets.TCPSocket, Bool})
+
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.IdentifySocketMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.CallWaitMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.CallMsg{:call}, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.CallMsg{:call_fetch}, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.ResultMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.IdentifySocketAckMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.RemoteDoMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.JoinPGRPMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+precompile(Tuple{typeof(DistributedNext.handle_msg), DistributedNext.JoinCompleteMsg, DistributedNext.MsgHeader, Sockets.TCPSocket, Sockets.TCPSocket, VersionNumber})
+
 # This is disabled because it doesn't give much benefit
 # and the code in Distributed is poorly typed causing many invalidations
 # TODO: Maybe reenable now that Distributed is not in sysimage.