add phi-3-mini eager mode example (#4315) #2062

Job	Run time
build-llm-demo (bpe) / linux-job	30m 13s
build-llm-demo (tiktoken) / linux-job	31m 59s
upload-artifacts	1m 32s
run-emulator	7m 22s
test-llama-app (bpe) / mobile-job (android)	4m 42s
	1h 15m 48s

Provide feedback