aiidateam / aiida_core / 5145

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Add support for the export/import of `Node` extras (#2416)

The extras of `Nodes` can now be exported together with other data.
When importing an archive that contains extras for nodes, the behavior
depends on whether that node was already present in the database into
which the data is imported, namely:

 * The `Node` did not yet exist: In this case, the extras will be imported
   wholesale or not at all. The behavior can be toggled from `verdi import`
   with the flag `--extras-mode-new`.

 * The `Node` already exists: In this case, the various possibilities are a
   lot more complex, because the existing and archived node can have
   overlapping and non-overlapping extras. What to do in case of conflicts
   and in general can be controlled by the flag `--extras-mode-existing`.
   The currently implemented options are as follows:

    - ask: import all extras and prompt what to do for existing extras.
    - keep_existing: import all extras and keep original value of existing.
    - update_existing: import all extras and overwrite value of existing.
    - mirror: remove any pre-existing extras and import all archive extras.
    - none: do not import any extras.

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