mod_muc_http_auth: Allow for enabling/disabling per user host IMPORTANT: This is a breaking change. The `muc_http_auth_enabled_for` and `muc_http_auth_disabled_for` options are now maps (with user hosts as keys) and not sets.

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.