pkg/proc: remove usage of gore dependency

[derekparker]

Implement the specific behavior we used from the gotetk/gore library without copying any code to avoid licensing issues.

Fixes #3661

[derekparker]

Currently marking as draft, this PR still needs work but I wanted to push for awareness on the upcoming change.

Still to do:

• Document offsets used when digging through moduledata
• Support 32-bit
• Support Darwin

[aktau]

Thanks a lot!