add fleurs zh task

Author: #LUU MINH THANG#

lmms_eval/tasks/fleurs/fleurs_cnn_hans_cn.yaml

@@ -0,0 +1,30 @@
+dataset_path: google/fleurs
+dataset_name: cmn_hans_cn
+dataset_kwargs:
+  token: True
+task: fleurs_cmn_hans_cn
+test_split: test
+output_type: generate_until
+doc_to_visual: !function utils.fleurs_doc_to_audio
+doc_to_text: !function utils.fleurs_doc_to_text
+doc_to_target: "transcription"
+generation_kwargs:
+  max_new_tokens: 256
+  temperature: 0
+  top_p: 1.0
+  num_beams: 1
+  do_sample: false
+process_results: !function utils.fleurs_process_result
+metric_list:
+  - metric: wer 
+    aggregation : !function utils.fleurs_wer
+    higher_is_better : false
+metadata:
+  - version: 0.0
+lmms_eval_specific_kwargs:
+  default:
+    pre_prompt: ""
+    post_prompt: ""
+  qwen2_audio:
+    pre_prompt: ""
+    post_prompt: " <|zh|>"