[New Sample] Add google/flan-t5-large computation graph, electra-small-discriminator, electra-base-discriminator, electra-base-generator (#113)

* Add google/flan-t5-large computation graph

* Add google/electra-small-discriminator computation graph

* Add google/electra-base-discriminator computation graph

* Add google/electra-base-generator computation graph

Author: Cutelemon6

samples/transformers-auto-model/google_electra_base_discriminator/graph_hash.txt

@@ -0,0 +1 @@
+0bdfa9da98570e4ad4ffabc94efe47e8f3c5bf0d6beb0537d51bf7818224ff43

samples/transformers-auto-model/google_electra_base_discriminator/graph_net.json

@@ -0,0 +1,6 @@
+{
+    "framework": "torch",
+    "num_devices_required": 1,
+    "num_nodes_required": 1,
+    "dynamic": false
+}