Meta issue: All event types

[hikingc]

Currently only m.room.message event is handled, but there is at least 10 diff events that go by the same endpoint so a big refactor is needed to allow them all by the same door. It is as follows

State events (has state_key)

• m.room.create
• m.room.member
• m.room.power_levels
• m.room.join_rules
• m.room.history_visibility
• m.room.guest_access
• m.room.name
• m.room.topic
• m.room.avatar
• m.room.canonical_alias
• m.room.pinned_events
• m.room.encryption
• m.room.server_acl
• m.room.tombstone
• m.room.third_party_invite
• m.space.child
• m.space.parent

Timeline / transactional events (no state_key, sent via txnId)

• m.room.message
• m.sticker
• m.reaction
• m.room.redaction
• m.room.encrypted
• m.call.invite
• m.call.candidates
• m.call.answer
• m.call.select_answer
• m.call.negotiate
• m.call.reject
• m.call.hangup
• m.key.verification.request
• m.key.verification.start
• m.key.verification.accept
• m.key.verification.key
• m.key.verification.mac
• m.key.verification.done
• m.key.verification.cancel

Not room-DAG events (different transport — /sync ephemeral or account_data)

• m.typing
• m.receipt
• m.presence
• m.tag
• m.direct
• m.fully_read

[hikingc]

Method overloads might be required if some events can't be satisfied with polymorphism (diff required keys)