EXP: support running flamegraph code

[ctb]

add debug symbols, force specific python version for wheel building.

To run flamegraph

create environment, build wheel, etc.

then (for Mac OS X, which requires sudo):

sudo flamegraph -o fastmultigather.svg -- python -m sourmash scripts fastmultig\
ather SRR606249.abundtrim.sig gtdb-rs207.genomic-reps.dna.k31.zip -c 1
sudo flamegraph -o fastgather.svg -- python -m sourmash scripts SRR606249.abund\
trim.sig gtdb-rs207.genomic-reps.dna.k31.zip -o xxx.csv -c 1

[luizirber]

Have you tried py-spy? It also generates flamegraphs, and can resolve Python call stacks + native extensions properly:
https://github.com/benfred/py-spy?tab=readme-ov-file#record
https://github.com/benfred/py-spy?tab=readme-ov-file#can-py-spy-profile-native-extensions