add precompile statements to sessionactions

[fonsp]

Co-Authored-By: Rik Huijzer 20724914+rikhuijzer@users.noreply.github.com

Split out from #1959

[github-actions]

Try this Pull Request!

Open Julia and type:

julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/fonsp/Pluto.jl", rev="more-precompile-sessionactions")
julia> using Pluto

[fonsp]

Before: https://github.com/fonsp/Pluto.jl/runs/5521590989?check_suite_focus=true#step:4:1122
After: https://github.com/fonsp/Pluto.jl/runs/5521595334?check_suite_focus=true#step:4:1122

That's surprising, almost no difference in allocations? So I guess that #1934 already did most of the work.

But nice! It looks like we can really easily compare PRs now, thanks Rik!

[rikhuijzer]

Before: https://github.com/fonsp/Pluto.jl/runs/5521590989?check_suite_focus=true#step:4:1122 After: https://github.com/fonsp/Pluto.jl/runs/5521595334?check_suite_focus=true#step:4:1122

That's surprising, almost no difference in allocations? So I guess that #1934 already did most of the work.

But nice! It looks like we can really easily compare PRs now, thanks Rik!

Yeah sorry. I commented in that different PR that the difference for me locally was 0.4 seconds. Not really much, but on the other hand they are basically for free. More gains for SessionActions.open require diving into what Core.Compiler.Timings.ROOT in typeinfer.jl:73 is doing (see the last image in #1934). I'm planning on diving into that