[BFCL] Add empower functions models and the supporting handler

[dyang415]

Thanks for the great benchmark @HuanzhiMao!

Create this PR to add the empower functions v1.1 model series models:

• Register empower functions model series
• Add empower_handler.py in support of running the newly added models
• Update vllm to 0.5.5 in support of Llama 3.1 based models

Evaluation result:

Rank	Overall Acc	Model	AST Summary	Exec Summary	Irrelevance Detection	Relevance Detection
1	86.92%	Empower-Fucntions-Large-v1.1 (FC)	82.55%	92.57%	78.51%	90.24%
2	83.89%	Empower-Fucntions-Small-v1.1 (FC)	77.45%	89.43%	82.69%	85.37%

[dyang415]

Hi @HuanzhiMao can you please take a look when you get a chance? Appreciate it!