[Wait for #2536][application] add generate_multiple_tokens for llm

[Wait for #2536][application] add generate_multiple_tokens for llm

Added generate_multiple_tokens function for first generation on llm.

This function takes one logits and generates multiple output tokens.
To meet the purpose of the target application,
even if input are multiple logits,
only the first logits is used to generate multiple output tokens.

**Self evaluation:**
1. Build test:	 [X]Passed [ ]Failed [ ]Skipped
2. Run test:	 [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Seungbaek Hong <sb92.hong@samsung.com>