js: add ogStorage to prevent localStorage key collission

Define ogStorage class to manage the localStorage operations.
The new keys are constructed with the following structure:
"group-context-id"
Where group is either "show" for the collapsed items in the
sidebar, or "check" for the selected checkboxes of the sidebar.

Add sotrage versioning to delete obsolete localStorage when a
new design for the storage is included in ogCP.

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