Add a command to export output notes from the cli

[tomyrd]

Feature description

There should be a way for a user to export a note that is not currently in their input note list. Currently only input notes are able to be exported. We should also add a way to list output notes so that the user can see which notes they can export.

Why is this feature needed?

If a user creates a private output note that is meant for an untracked account they don't have a way to export it via de cli.

[igamigo]

As part of this and as we discussed offline, we should also likely try to merge the note-related commands under a notes command, unless it becomes too cluttered

[mFragaBA]

As part of this and as we discussed offline, we should also likely try to merge the note-related commands under a notes command, unless it becomes too cluttered

One way to do this is to never expose what's an input/output note to the CLI user. This way:

• when exporting a note, we actually just fetch the corresponding output note records and convert it to an input note before serializing it
• when importing a note we always import input note records (note that it might not have all the data necessary to convert it into an InputNote.

Obviously by doing that we'd lose the ability to export a note that is only in the input note records table, but in that situation:

• either we fetched the note from the node because it's an input note
• we received the serialized input note and imported it

Hence, it wouldn't make sense to import those input notes and then re-export them since we either have the serialized note already, or the other client can just sync with the node to receive the note if it was a public one.

Is that assessment correct or am I missing something @igamigo @bobbinth

[bobbinth]

As part of this and as we discussed offline, we should also likely try to merge the note-related commands under a notes command, unless it becomes too cluttered

One thing to keep in mind is that we may have the same not in both input and output tables - so, one open question is how to handle such duplicates.

Obviously by doing that we'd lose the ability to export a note that is only in the input note records table,

Under what conditions do we need to import output notes or export input notes? I was thinking that:

• We import only input notes.
• We export only output notes, and only the ones which have full note details.

[mFragaBA]

Under what conditions do we need to import output notes or export input notes? I was thinking that:

* We import only input notes.

* We export only output notes, and only the ones which have full note details.

I was trying to say this. Much clearer summary. Other flows (importing output note / exporting input note) don't make much sense

[mFragaBA]

closing as #318 got merged, it'll be included in the release of 0.3