Add SailorLLM template

[chenhuiyu]

What does this PR do?

This PR adds a new template for SailorLLM to the repository, which enhances the system's ability to format user and system inputs according to the SailorLLM format. This template uses the following structure:

• User Format: <|im_start|>question\n{{content}}<|im_end|>\n<|im_start|>answer\n
• System Format: <|im_start|>system\n{{content}}<|im_end|>\n
• Separator: \n
• Stop Words: ["<|im_end|>"]
• Replace EOS: True

This addition is based on the SailorLLM's formatting style, as referenced from the SailorLLM repository.

SailorLLM is a suite of Open Language Models for South-East Asia (SEA), focusing on languages like Indonesian, Thai, Vietnamese, Malay, and Lao. Built on Qwen 1.5, Sailor models range from 0.5B to 14B parameters and are fine-tuned for SEA language tasks. Sailor models on Hugging Face. This template supports Sailor models of sizes 0.5B/1.8B/4B/7B/14B.
Fixes # (issue)

No specific issue is linked to this PR.

Before submitting

• Did you read the contributor guideline?
• Did you write any new necessary tests?

[hiyouga]

LGTM!