v.gen.js: fix method calls and other codegen parts, rand module compiles (#11205)

vlib/rand/config/config.v

@@ -0,0 +1,13 @@
+module config
+
+import rand.seed
+
+// PRNGConfigStruct is a configuration struct for creating a new instance of the default RNG.
+// Note that the RNGs may have a different number of u32s required for seeding. The default
+// generator WyRand used 64 bits, ie. 2 u32s so that is the default. In case your desired generator
+// uses a different number of u32s, use the `seed.time_seed_array()` method with the correct
+// number of u32s.
+pub struct PRNGConfigStruct {
+pub:
+	seed_ []u32 = seed.time_seed_array(2)
+}