WIP: Add simple pmc collapse to replace stackcollapse-pmc.pl.

[pbmtp]

This is the start of a Rustification of stackcollapse-pmc.pl perl script.

DONE:

• basic code (i am still learning Rust so feel free to suggest modification)
• criterion bench
• compare.sh (i need to do a pull request on brendangregg/FlameGraph for a little fix and optimization for stackcollapse-pmc.pl script)
• guess code
• regression tests (guess + pmc)

TODO:

• implement kernel suffixing
• filter raw function name (address)
• symbol demangling (not done by pmcstat not for C++ nor for Rust)

[codecov]

Codecov Report

Merging #214 (9c1945c) into master (9737ac7) will decrease coverage by 0.31%.
The diff coverage is 90.76%.

@@            Coverage Diff             @@
##           master     #214      +/-   ##
==========================================
- Coverage   89.64%   89.33%   -0.32%     
==========================================
  Files          17       18       +1     
  Lines        2357     2485     +128     
==========================================
+ Hits         2113     2220     +107     
- Misses        244      265      +21     

Impacted Files	Coverage Δ
src/collapse/mod.rs	52.63% <ø> (ø)
src/collapse/guess.rs	69.76% <80.00%> (+0.53%)	⬆️
src/collapse/pmc.rs	91.20% <91.20%> (ø)
src/collapse/vtune.rs	90.41% <0.00%> (-2.74%)	⬇️
src/collapse/sample.rs	88.88% <0.00%> (-2.03%)	⬇️
src/flamegraph/attrs.rs	90.62% <0.00%> (-1.05%)	⬇️
src/collapse/dtrace.rs	88.05% <0.00%> (-1.00%)	⬇️
src/collapse/perf.rs	95.07% <0.00%> (-0.38%)	⬇️
src/flamegraph/mod.rs	97.26% <0.00%> (-0.35%)	⬇️
src/collapse/common.rs	59.52% <0.00%> (-0.14%)	⬇️
... and 1 more

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