Add Llama-2 example #17181

Job	Run time
pyflakes	3m 18s
cancel	3s
Check if image exists in registry	5s
licensing	4m 45s
linux-fpga (ubuntu-20.04, debug)	21m 46s
linux (ubuntu-20.04, debug)	22m 44s
linux (ubuntu-20.04, release)	54m 10s
linux (ubuntu-20.04, codecov)	51m 29s
Build SLES image	55m 19s
Build image	55m 2s
format	4m 36s
cppcheck	22m 29s
tidy	45m 43s
sles	22m 35s
	6h 4m 4s

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