[New Sample] Add 25 samples for bert, convbert, nezha, roformer, skep_ernie, ernie-m, ppmimilm models. (#255)

* Add bert and convbert models.

* Add roformer and skep models.

* Add ernie-m and ppminilm models.

Author: Xreki

paddle_samples/PaddleNLP/bert-base-chinese/graph_hash.txt

@@ -0,0 +1 @@
+c1e7e52eab55414cee7c44a9e8c4f81bbd59e3837b185e179e6317efa04f69ec

paddle_samples/PaddleNLP/bert-base-chinese/graph_net.json

@@ -0,0 +1,6 @@
+{
+    "framework": "paddle",
+    "model_name": "bert-base-chinese",
+    "num_devices_required": 1,
+    "num_nodes_required": 1
+}

paddle_samples/PaddleNLP/bert-base-chinese/input_meta.py

@@ -0,0 +1,12 @@
+class Program_weight_tensor_data_0:
+    name = "data_0"
+    shape = [1, 11]
+    dtype = "int64"
+    data = [101, 3614, 6816, 886, 4500, 4636, 2428, 7607, 3444, 106, 102]
+
+
+class Program_weight_tensor_data_1:
+    name = "data_1"
+    shape = [1, 11]
+    dtype = "int64"
+    data = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]