make rms_norm_eps a parameter (#2374)

* make rms_norm_eps a parameter

* add rms_norm_eps to command line

* fix baby llama, test-grad0

* use scientific notation for eps param in the help

ggml-ci

ggml-metal.m

@@ -812,7 +812,8 @@ void ggml_metal_graph_compute(
                                 encoder = [command_buffer computeCommandEncoder];
                             }
 
-                            const float eps = 1e-6f;
+                            float eps;
+                            memcpy(&eps, dst->op_params, sizeof(float));
 
                             const int nth = 512;