plugin XEP-0033: code modernisation, improve delivery, data validation: - Code has been rewritten using Pydantic models and `async` coroutines for data validation and cleaner element parsing/generation. - Delivery has been completely rewritten. It now works even if server doesn't support multicast, and send to local multicast service first. Delivering to local multicast service first is due to bad support of XEP-0033 in server (notably Prosody which has an incomplete implementation), and the current impossibility to detect if a sub-domain service handles fully multicast or only for local domains. This is a workaround to have a good balance between backward compatilibity and use of bandwith, and to make it work with the incoming email gateway implementation (the gateway will only deliver to entities of its own domain). - disco feature checking now uses `async` corountines. `host` implementation still use Deferred return values for compatibility with legacy code. rel 450

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uri: XMPP URI parsing/generation
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URI commands are helper to easily parse/build XMPP URIs.

parse
=====

Parse an XMPP URI, and print different parts.

When possible, the ``type`` of URI is shown (e.g. ``pubsub``) and the ``sub_type`` (e.g.
``microblog``).

The ``path`` is always displayed (see `RFC 5122 Path section`_ for details).

If suitable, you'll also get data like ``node`` (for a PubSub URI).

.. _RFC 5122 Path section: https://tools.ietf.org/html/rfc5122#section-2.4

examples
--------

Parse a blog URI::

  $ li uri parse "xmpp:somebody@example.org?;node=urn%3Axmpp%3Amicroblog%3A0"

build
======

Build an XMPP URI according to arguments. 2 positional arguments are expected: ``type``
and ``path``. For now, only ``pubsub`` type is supported.

examples
--------

Build XMPP URI for a blog::

  $ li uri build pubsub somebody@example.org -f node urn:xmpp:microblog:0