Support of AsyncProfiler generated stack trace

[AnderEnder]

• based on Async Profiler flamegraph implementation
• add exception for . case to support correct behavior with another java traces
• fix test case to support new behaviour
• add more test cases to test new behavior
• add integration test with example async-profiler collapsed file

Related: #26
Backport PR(idea): brendangregg/FlameGraph#234

[codecov]

Codecov Report

Merging #183 into master will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #183      +/-   ##
==========================================
+ Coverage   90.53%   90.65%   +0.11%     
==========================================
  Files          17       17              
  Lines        2293     2311      +18     
==========================================
+ Hits         2076     2095      +19     
+ Misses        217      216       -1     

Impacted Files	Coverage Δ
src/flamegraph/color/palettes.rs	99.65% <100.00%> (+0.02%)	⬆️
src/flamegraph/color/mod.rs	81.81% <0.00%> (+0.69%)	⬆️

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[AnderEnder]

@jonhoo, Async-profiler can produce raw output: traces or already collapsed. For this case I received a huge file with traces from async-profiler and I did not find a way to convert it to collapsed format. I made a dumb convertor. Do you think it would be valuable to put this convertor implementation into inferno tool set as well?

[jonhoo]

Hmm, that's an interesting question.. I don't know enough about the Java async space to really say, but if it's a common enough format, it seems pretty reasonable to add inferno-collapse-java-async.

[AnderEnder]

@jonhoo I asked my friend and did not received the straight answer: use cases are different. I think this question could be moved to an issue and if anyone will require this use case we can implement it.

[jonhoo]

Released in 0.10.1.