Problem: memiavl db in CacheMultiStoreWithVersion not closed

[yihuang]

Solution:

• add a wrapper that supports io.Closer

Impact:

• this PR only adds a Closer method to it, but not call it, for example, sdk grpc query service will not call it, unless patched.
• versiondb nodes handle grpc queries without memiavl, so no problem there.
• for other use cases that use memiavl's CacheMultiStoreWithVersion method should call the Close() method explicitly.
• ideally we should patch sdk itself to add Close method, it's relevant to existing iavl as well.

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