mod_auth_cyrus: Add empty 'profile' table to SASL handler objects This is for compatibility with Prosody's built-in util.sasl objects. A SASL profile table usually includes methods supported by the backend, which can be used by SASL mechanism handlers to perform operations (such as testing the password). It also optionally contains a 'cb' field with channel binding method handlers. The Cyrus backend doesn't support channel binding, and doesn't have the same concept of auth backend methods (it handles all that internally, and Prosody has no insight or control over it). Thus, we create an empty profile which informs Prosody that the SASL handler does not support any of the auth or channel binding methods. Some features will not work, but they didn't work anyway. This just makes it explicit. This fixes a traceback in mod_sasl2_fast, which expected SASL handlers to always contain a 'profile' field.

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summary: 'XEP-0502 (MUC Activity Indicator) implementation'
...

This module provides an implementation of [XEP-0502 (MUC Activity Indicator)](https://xmpp.org/extensions/xep-0502.html) for Prosody.

To enable it, load it on a MUC host, for example:

```lua
Component "chat.domain.example" "muc"
    modules_enabled = { "muc_activity" }
```

When this module is loaded, it will expose the average number of messages per hour for all public MUCs.
The number is calculated over a 24 hour window.

Note that this module may impact server performance on servers with many MUCs.