Add option to specify threads and tasks on 1.8

[IanButterworth]

I've been trying to get ProfileView setup to handle this before claiming victory, but here's WIP over here.

My general strategy is to generate one flamegraph per threadid or all_threads, and stack them in the ProfileView window with some form of combobox selector for [all, 1, 2, 3, 4 ...]. As opposed to somehow embedding the thread info into the flamegraph itself and selectively pruning it in the GUI.

• [x] Add tests with thread/task specified

[codecov[bot]]

Codecov Report

Merging #44 (b59d9c9) into master (1e5f746) will increase coverage by 0.08%. The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   92.79%   92.87%   +0.08%     
==========================================
  Files           5        5              
  Lines         347      351       +4     
==========================================
+ Hits          322      326       +4     
  Misses         25       25              

Impacted Files	Coverage Δ
src/FlameGraphs.jl	0.00% <0.00%> (ø)
src/graph.jl	94.33% <100.00%> (+0.22%)	:arrow_up:

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[IanButterworth]

@timholy this should be ready for review now

It works with https://github.com/timholy/ProfileView.jl/pull/176

[IanButterworth]

I'd be happy to merge this, do a patch release, and finish up https://github.com/timholy/ProfileView.jl/pull/176 if you don't have time to review, and are ok with that, @timholy ?

[timholy]

I have a ton of faith in your work, so in the absence of feedback from me, go for it! I haven't yet poked at this, but the plan sounds great!