Multi-language support

[iori-yja]

Is your feature request related to a problem? Please describe.
Current implementation is for Java, inspired by flame-in-java by Netflix blog. However, the key technique is applicable for other compiled languages.

Technically speaking, it will be possible to support many languages with this tool.

Describe the solution you'd like
convert tool handles multi-language support and the converted images emit format logs in same way so that other analyzer can stay away from those complexities.

Additional context
for go, pprof may be enough, I don't know but...