[Feat] add falcon-40b (#76)

* [Feat] add falcon-40b

* minor fix

configs/models/hf_falcon_40b.py

+# Only torch >=2.0 is supported for falcon-40b
+from opencompass.models import HuggingFaceCausalLM
+
+models = [
+    dict(
+        type=HuggingFaceCausalLM,
+        abbr='falcon-40b-hf',
+        path='tiiuae/falcon-40b',
+        tokenizer_path='tiiuae/falcon-40b',
+        tokenizer_kwargs=dict(
+            padding_side='left',
+            truncation_side='left',
+            trust_remote_code=True,
+        ),
+        max_out_len=100,
+        max_seq_len=2048,
+        batch_size=8,
+        model_kwargs=dict(trust_remote_code=True, device_map='auto', revision='561820f7eef0cc56a31ea38af15ca1acb07fab5d'),
+        run_cfg=dict(num_gpus=4, num_procs=1),
+    )
+]