Support brendangregg's flamegraph format.

[laixintao]

No description provided.

[codecov-commenter]

Codecov Report

Merging #63 (a45a714) into main (49125c3) will decrease coverage by 0.03%.
The diff coverage is 94.77%.

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
- Coverage   94.27%   94.25%   -0.03%     
==========================================
  Files          15       17       +2     
  Lines        1066     1183     +117     
==========================================
+ Hits         1005     1115     +110     
- Misses         61       68       +7     

Files	Coverage Δ
flameshow/main.py	100.00% <100.00%> (ø)
flameshow/models.py	99.15% <96.29%> (-0.85%)	⬇️
flameshow/parsers/__init__.py	94.11% <94.11%> (ø)
flameshow/render/framedetail.py	85.49% <75.00%> (ø)
flameshow/parsers/stackcollapse_parser.py	97.46% <97.46%> (ø)
flameshow/pprof_parser/parser.py	97.10% <86.95%> (-1.42%)	⬇️

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