Chatbot support & bug fixes

What's Changed

• Chatbot by @aniketmaurya in #4
• Refactor bot by @aniketmaurya in #5

How to use Chatbot

from chatbot import LLaMAChatBot

checkpoint_path = f"state_dict.pth"
tokenizer_path = f"tokenizer.model"

bot = LLaMAChatBot(
    checkpoint_path=checkpoint_path, tokenizer_path=tokenizer_path
)

print(bot.send("hi, what is the capital of France?"))

Full Changelog: v0.0.2...v0.0.3