[Task] Allow setting more state events from CreateRoomParameters

[ganfra]

When creating a room, we have a struct to define all the parameters :

data class CreateRoomParameters (
    var `name`: kotlin.String?, 
    var `topic`: kotlin.String? = null, 
    var `isEncrypted`: kotlin.Boolean, 
    var `isDirect`: kotlin.Boolean = false, 
    var `visibility`: RoomVisibility, 
    var `preset`: RoomPreset, 
    var `invite`: List<kotlin.String>? = null, 
    var `avatar`: kotlin.String? = null, 
    var `powerLevelContentOverride`: PowerLevels? = null, 
    var `joinRuleOverride`: JoinRule? = null, 
    var `canonicalAlias`: kotlin.String? = null
) 

Following the spec https://spec.matrix.org/v1.10/client-server-api/#post_matrixclientv3createroom we should be able to give any state events.

In our case, we'd like to allow overriding history_visibility state.

2 solutions :

• allow to give any state event, but this will need to expose all the StateEvent from Ruma somehow...
• offer a new historyVisibilityOverride as the joinRuleOverride