[Azure] SkyPilot provisioner for Azure #15258

Job	Run time
python-test (3.8, tests/unit_tests)	5m 57s
python-test (3.8, tests/test_api.py)	3m 23s
python-test (3.8, tests/test_cli.py)	3m 37s
python-test (3.8, tests/test_config.py)	3m 15s
python-test (3.8, tests/test_global_user_state.py)	3m 5s
python-test (3.8, tests/test_jobs.py)	3m 35s
python-test (3.8, tests/test_list_accelerators.py)	3m 20s
python-test (3.8, tests/test_optimizer_dryruns.py)	4m 53s
python-test (3.8, tests/test_optimizer_random_dag.py)	4m 6s
python-test (3.8, tests/test_storage.py)	3m 12s
python-test (3.8, tests/test_wheels.py)	3m 16s
python-test (3.8, tests/test_jobs_and_serve.py)	3m 5s
python-test (3.8, tests/test_yaml_parser.py)	3m 15s
	47m 59s

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