Investigate using a go cache

[rkuris]

Describe the bug
Looking at the long pole for merging, building go code is the slowest thing, especially if we then run a 1m fuzz test after building go.

To Reproduce
Run a build. You can see the ethhash fuzz test takes longer than anything else, and most of that time is building golang.

Expected behavior
Rust should be slower at building than golang, no?

Possible Solutions
Add a go cache