Add compile workload timing prints when PRECOMPILETOOLS_TIMING=1

[IanButterworth]

Just gives one level of granularity per top line in the expr, and a total @time at the end. (reassuringly GLMakie spends 94% of its time compiling)

% PRECOMPILETOOLS_TIMING=1 julia -q
julia> using GLMakie
[ Info: Precompiling GLMakie [e9467ef8-e4e7-5192-8a1a-b1aee30e663a] (caches not reused: 1 for dependency identifier changed)
[ Info:       4 ms: GLMakie.activate!()
[ Info:    1255 ms: screen = GLMakie.singleton_screen(false)
[ Info:     319 ms: close(screen)
[ Info:      71 ms: destroy!(screen)
[ Info:       0 ms: base_path = normpath(joinpath(dirname(pathof(Makie)), "..", "precompile"))
[ Info:       0 ms: shared_precompile = joinpath(base_path, "shared-precompile.jl")
 17.258217 seconds (144.47 M allocations: 8.297 GiB, 8.12% gc time, 94.54% compilation time: 1% of which was recompilation)
[ Info:   17270 ms: #= /Users/ian/Documents/GitHub/Makie.jl/GLMakie/src/precompiles.jl:26 =# @time include(shared_precompile)
┌ Info:     167 ms:
│ try
│     #= /Users/ian/Documents/GitHub/Makie.jl/GLMakie/src/precompiles.jl:28 =#
│     display(plot(x); visible = false)
│ catch
│     #= /Users/ian/Documents/GitHub/Makie.jl/GLMakie/src/precompiles.jl:29 =#
└ end
[ Info:       0 ms: Makie.CURRENT_FIGURE[] = nothing
[ Info:      38 ms: screen = Screen(Scene())
[ Info:       1 ms: refresh_func = refreshwindowcb(screen)
[ Info:       2 ms: refresh_func(to_native(screen))
[ Info:      20 ms: close(screen)
[ Info:       9 ms: screen = empty_screen(false)
[ Info:       2 ms: close(screen)
[ Info:       3 ms: destroy!(screen)
[ Info:       6 ms: screen = empty_screen(false, false, nothing)
[ Info:       4 ms: destroy!(screen)
[ Info:       0 ms: config = Makie.merge_screen_config(ScreenConfig, Dict{Symbol, Any}())
[ Info:       4 ms: screen = Screen(Scene(), config, nothing, (MIME"image/png")(); visible = false, start_renderloop = false)
[ Info:       0 ms: close(screen)
[ Info:       0 ms: config = Makie.merge_screen_config(ScreenConfig, Dict{Symbol, Any}())
[ Info:       2 ms: screen = Screen(Scene(), config; visible = false, start_renderloop = false)
[ Info:       0 ms: close(screen)
[ Info:      63 ms: closeall(; empty_shader = false)
[ Info:       1 ms: #= /Users/ian/Documents/GitHub/Makie.jl/GLMakie/src/precompiles.jl:52 =# @assert isempty(SCREEN_REUSE_POOL)
[ Info:       0 ms: #= /Users/ian/Documents/GitHub/Makie.jl/GLMakie/src/precompiles.jl:53 =# @assert isempty(ALL_SCREENS)
[ Info:       1 ms: #= /Users/ian/Documents/GitHub/Makie.jl/GLMakie/src/precompiles.jl:54 =# @assert isempty(SINGLETON_SCREEN)
@compile_workload: 19.292506 seconds (158.20 M allocations: 8.949 GiB, 7.76% gc time, 93.73% compilation time: 1% of which was recompilation)

[codecov]

Codecov Report

❌ Patch coverage is 67.74194% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.90%. Comparing base (542d964) to head (9e1c8a8).

Files with missing lines	Patch %	Lines
src/workloads.jl	67.74%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #72      +/-   ##
==========================================
- Coverage   82.47%   78.90%   -3.57%     
==========================================
  Files           3        3              
  Lines          97      128      +31     
==========================================
+ Hits           80      101      +21     
- Misses         17       27      +10     

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