[Kernel] Add GPU kernels and enable LLaMA model.

[changqi1]

How to build and test w/ single Intel GPU

source /opt/intel/oneapi/setvars.sh
source ../3rdparty/oneccl/build/_install/env/setvars.sh

export CC=icx
export CXX=icpx
mkdir build && cd build
cmake .. -DWITH_GPU=ON
make -j

OMP_NUM_THREADS=20 mpirun -n 1 -env XFT_ENGINE=GPU:0 numactl -N 0 -m 0 ./example \
        --model /home/xfast/models/llama-2-7b-chat-xft/ \
        --token /home/xfast/models/llama-2-7b-chat-hf/tokenizer.model \
        --dtype fp16 \
        --loop 3 \
        --no_stream \
        --input_len 18 \
        --output_len 8

[INFO] First token time: 69.575 ms
[INFO] Second token time: 61.2469 ms
[INFO] Final output is:
==============================================
Once upon a time, there existed a little girl who liked to have adventures. She lived in a small village surrounded by

[pujiang2018]

deleted the object or not?

[changqi1]

delete in destructor