[Enhancement] TigerTune: Support more Llama2 and Falcon models

[lilinwang]

Currently, the logic tell if a model is Llama2 or Falcon is via hardcoded strings, like "tiiuae/falcon-7b", at

tiger/TigerTune/tigertune/finetuning/llm/text_generation_transformer.py

Line 68 in 8ad8d38

if base_model_id == "tiiuae/falcon-7b":

and

tiger/TigerTune/tigertune/finetuning/llm/text_generation_transformer.py

Line 332 in 8ad8d38

if self.base_model_id == "tiiuae/falcon-7b":

.

It would be useful to replace these hardcoded strings with a more systematic approach.