Perf/fast repeat install (#730)

* perf: validating the node_modules structure to a specified depth

Ref #722

* feat: adding an update boolean property to the install API

BREAKING CHANGE:

Dependencies won't be updated when `update` is `false`.
It doesn't matter what the value of `depth` is.
`depth` is used for specifying how deep should the install
algorithm analize the dependency tree.

Ref #722

* refactor: merge new resolved deps with the previous
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