Related to https://github.com/element-hq/synapse/pull/17147

* feat: auto-accept-invite module and docs

* fix: name typos and some forgot to adjust variables

* fix: accept only direct messages should work now and better wording

* changed: only_direct_messages variable naming

* feat: add logger, add synapse workers config

* Fix typo and add details about synapse-auto-acccept-invite

* Add newline at end of file

* Fix alignment

* Fix logger name for synapse_auto_accept_invite

The name of the logger needs to match the name of the Python module.

Ref: d673c67678/synapse_auto_accept_invite/__init__.py (L20)

* Add missing document start YAML annotation

* Remove trailing spaces

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Co-authored-by: Slavi Pantaleev <slavi@devture.com>