Explicit is better than implicit: let user install the dependencies explicitly

[shenxiangzhuang]

Currently, when using milvus-model package, it will install the dependencies implicitly using pip:

milvus-model/src/pymilvus/model/utils/dependency_control.py

Lines 3 to 12 in 2fe97ac

	def prompt_install(package: str, warn: bool = False): # pragma: no cover
	cmd = f"pip install -q {package}"
	try:
	if warn and input(f"Install {package}? Y/n: ") != "Y":
	raise ModuleNotFoundError(f"No module named {package}")
	print(f"start to install package: {package}")
	subprocess.check_call(cmd, shell=True)
	print(f"successfully installed package: {package}")
	except subprocess.CalledProcessError as e:
	raise ValueError(f"install error {e}")

But the user may not use pip to manage there env at all... When the log says that successfully installed package: xxx, which actually means successfully installed(by pip) package: xxx . So current log message will confuse the user IMO.