just-lock: Initial implementation of --clone option

This option stages locally the sources (i.e., workspace root) of a
target repository found by following a list of bindings from a
known starting repository. The final configuration will keep during
deduplication the names of each starting repository and each target
repository, with the output configuration updated to point to these
local clones. Precomputed repositories cannot be cloned.

Implementation is split in multiple commits.

This commit contains the main logic for handling cloning. Currently
only support for 'file' repositories is implemented. The code
structure allows it to be subsequently extended to all other
repository types.

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