feat: add basic information on profiling python code

[bhearsum]

No description provided.

[bhearsum]

@Eijebong - flagging you mainly so you can follow-up with the TODO section.

[ahal]

Thanks for adding this!

I have this alias setup:

alias py-samply="PYTHONPERFSUPPORT=1 samply record  --include-args"

So you can just do py-samply ./mach taskgraph tasks

[abhishekmadan30]

To enable python frame pointers you can use this (Samply) : CFLAGS="-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer" pyenv install 3.12
Its from this : https://gist.github.com/jrmuizel/63667a68ccb65ede9346a29c6a29aadc

Also I think we should add the samply only works with python frame pointers on linux currently.
To make it compatible on Mac, you need to create your own python exectuable but that doesnt work for features within mozilla central as ./mach cant be profiled that way but for other repos it can

I can also add this in a subsequent patch

[bhearsum]

I think both of these could be good additions -- you can both submit follow-ups :)