- update psSubscriptionsGet to use serialised return value
- implement XEP-0376 Pubsub Account Management
- implement XEP-0465 Public Pubsub Subscriptions
- CLI `pubsub` commands updated accordingly, and added `--public` flags to `subscribe`,
`Subscriptions` and `node Subscriptions get`
⚠ `XEP-0465` is speculative, the XEP has been accepted by council but not published yet.
As is should be the next one, and current latest one is `XEP-0464`, `XEP-0465` has been
anticipated.
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