Implement verbose logging in aim storage

[alberttorosyan]

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Proposed refactoring or deprecation

Currently the logging on the storage module is sparse, non-informative and in some cases even misleading. Need to introduce verbose logging allowing to collect all the data about important (and time-consuming) operations performed. Examples of such operations are, opening/re-opening rocksdb Container indexing, etc.

Verbosity level can be set on CLI command via -v, -vv, -vvv options. On the SDK level, in can be a property of a Repo.

Motivation

Better understanding of how system performs in complex scenarios