build all zkvm binaries + cli at once

[gballet]

Changes the build system to build all supported platforms in one go when typing zig build. We will further extend it to also build the full client down the road. This is a prerequisite for #3

EDIT

This now builds every binary at once, using zig build. It's only building the tests for the state transition.

TODO

• build tests for all packages
• rename the pkgs/ subdirectory to src/, since all modules are no longer stored as independent packages
• remove all other src/ subdirectories
• rebase :(

[g11tech]

i somehow feel the top level builds should be like triggering the all the package builds, and test trigger all package level tests

a monorepo kinda build system

[gballet]

i somehow feel the top level builds should be like triggering the all the package builds, and test trigger all package level tests

a monorepo kinda build system

yes, and I want to do that as well. I was just doing the first part, but I can expand.

[g11tech]

lgtm