[tools-v2]:add bs status volume snapshot

[Cyber-SiKu]

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Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)

Describe the solution you'd like (描述你期望的解决方法)

curve/tools/snaptool/snaptool.py

Lines 30 to 31 in 44949da

	elif args.optype == "snapshot-status":
	querysnap.snapshot_status(args)

Describe alternatives you've considered (描述你想到的折衷方案)

Additional context/screenshots (更多上下文/截图)

[saicaca]

Hello, I'd like to implement this. Please assign it to me.

[wuhongsong]

Hello, I'd like to implement this. Please assign it to me.

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