Profiler improvements: (textual) time distribution, at-bprofile.

[maleadt]

julia> x = @bprofile time=0.01 CuArray([1]).+1
Profiler ran for 10.0 ms, capturing 13651 events.

Host-side activity: calling CUDA APIs took 7.28 ms (72.74% of the trace)
┌──────────┬────────────┬───────┬──────────────────────────────────────┬─────────────────────────┐
│ Time (%) │ Total time │ Calls │ Time distribution                    │ Name                    │
├──────────┼────────────┼───────┼──────────────────────────────────────┼─────────────────────────┤
│   18.28% │    1.83 ms │   525 │   3.48 µs ± 0.62   (   3.1 ‥ 15.02)  │ cuLaunchKernel          │
│   16.11% │    1.61 ms │   525 │   3.07 µs ± 0.22   (  1.43 ‥ 3.81)   │ cuCtxSynchronize        │
│   16.03% │     1.6 ms │   525 │   3.05 µs ± 8.31   (  2.15 ‥ 192.88) │ cuMemcpyHtoDAsync       │
│   12.53% │    1.25 ms │  1050 │   1.19 µs ± 0.44   (  0.72 ‥ 8.34)   │ cuMemAllocFromPoolAsync │
│    1.58% │  158.07 µs │   525 │ 301.09 ns ± 119.54 (238.42 ‥ 715.26) │ cuStreamSynchronize     │
└──────────┴────────────┴───────┴──────────────────────────────────────┴─────────────────────────┘

Not as nice as BenchmarkTool's histograms, but we can't fit those in a table.
This is as much information as I could neatly pack into a single cell.

@bprofile is pretty naive as I didn't want to depend on BenchmarkTools for better logic, but it's a good start.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (853baef) 72.37% compared to head (2e3f433) 72.63%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2162      +/-   ##
==========================================
+ Coverage   72.37%   72.63%   +0.26%     
==========================================
  Files         159      159              
  Lines       14535    14592      +57     
==========================================
+ Hits        10519    10599      +80     
+ Misses       4016     3993      -23     

Files	Coverage Δ
src/profile.jl	83.43% <92.30%> (+7.48%)	⬆️

... and 1 file with indirect coverage changes

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