Experiment with openllama-3b with a modified template

[kannangce]

Use the below template to fine-tune and test openllama-3b.

<s>
<<SYS>>The response MUST be a valid JSON. Generate UI-DSL for the below input and context.<</SYS>>
{%- if context -%}## Input: {{ context }}{%- endif -%}
[INS]## Instruction: {{ prompt }}[/INS]
## UI-DSL: ```{{ response }}```
</s>

The similar one also need to be updated under lora_ui_gen.py during inference.