Golang Profiling: Brief Guide

[matthawkins90]

I'm trying to teach myself Go.
In order to get a good idea about possible low-hanging-fruit that could be optimized in our software, I think it would be good to briefly document how to profile golang code.

I think it would fit nicely in the Contributing section of the docs.

I'm going to work on this, but I would welcome any tips from devs who are experienced at profiling in golang, and who have any suggestions.

[jholdstock]

Similar to #106, this is covered thoroughly here https://go.dev/blog/pprof