Add support for XMPP

[waybackarchiver]

Description

Closes #225

Checklist

• I have followed the contributing guidelines
• I have reviewed and understood the Code of Conduct
• I have searched and make sure there's no duplicate PRs

[codecov]

Codecov Report

Patch coverage: 38.67% and project coverage change: -0.40 ⚠️

Comparison is base (4bbf9ea) 48.32% compared to head (8704d26) 47.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #380      +/-   ##
==========================================
- Coverage   48.32%   47.92%   -0.40%     
==========================================
  Files          58       60       +2     
  Lines        5240     5496     +256     
==========================================
+ Hits         2532     2634     +102     
- Misses       2444     2589     +145     
- Partials      264      273       +9     

Impacted Files	Coverage Δ
publish/publish.go	44.15% <ø> (ø)
service/service.go	70.37% <ø> (ø)
service/xmpp/xmpp.go	28.98% <28.98%> (ø)
template/render/xmpp.go	62.96% <62.96%> (ø)
config/options.go	93.97% <100.00%> (+0.26%)	⬆️
config/parser.go	92.11% <100.00%> (+0.27%)	⬆️

... and 1 file with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.