Update Zig bindings to Zig 0.12.0 (#1951)

* update zig bindings to Zig 0.12.0

* support zig package manager

* Fix zig macos ci build

* Make the macos build use 1 process instead of hitting the macos
  process limit immediately, utilize the build.zig `-Dparallel
  false` option for macos ci
* Split the macos ci into a new build stage (out of the ubuntu,
  macos build maxtrix), to allow for multiple architecture builds
  in the future after the zig bindings improve

build.zig.zon

@@ -0,0 +1,5 @@
+.{
+    .name = "unicorn",
+    .version = "2.0.0",
+    .paths = .{""},
+}