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

[JamesWrigley]

Before:

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> @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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.48%. Comparing base (b9a8000) to head (c3bbb70).
Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
+ Coverage   86.37%   86.48%   +0.10%     
==========================================
  Files          10       10              
  Lines        1982     1983       +1     
==========================================
+ Hits         1712     1715       +3     
+ Misses        270      268       -2     

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