Add zig-datetime and zig-network submodules

Author: g41797

build.zig

@@ -29,7 +29,6 @@ pub fn build(b: *std.Build) void {
     // running `zig build`).
     b.installArtifact(lib);
 
-
     // Creates a step for unit testing. This only builds the test executable
     // but does not run it.
     const lib_unit_tests = b.addTest(.{