Reduce noise from Power Level Warning

[AnnalizaMoodley1]

Hi matrix-corporal team,

We are currently running a self-hosted Matrix server with matrix-corporal. Since our last update, we have observed a recurring WARN log message that is increasing our log file size.

Warning message: Failed to determine user's power level

Relevant Code:
getPowerLevelByRoomIdAndUserId function in corporal/connector/api.go

Issue:
From our perspective, the successful fallback to the users default power level is acceptable behavior and is not indicative of a 'failure' or any action that needs to be taken. However, our logs are filling up with the warning messages. We also can't find a setting to control the log level in order to ignore warnings.

Proposed Solutions:

1. Reduce the log level of this specific message:

We recommend modifying the logger.Warn("Failed to determine user's power level") line within the getPowerLevelByRoomIdAndUserId function to logger.Info(...) or logger.Debug(...).
This would reflect that a default value was successfully applied.

Suggested code:

func (me *ApiConnector) getPowerLevelByRoomIdAndUserId(
	ctx *AccessTokenContext,
	roomId string,
	userId string,
) (int, error) {
	client, err := me.createMatrixClientForUserId(ctx, userId)
	if err != nil {
		return 0, err
	}

	var content map[string]interface{}
	err = client.StateEvent(roomId, "m.room.power_levels", "", &content)
	if err != nil {
		return 0, err
	}

	jsonObj := gabs.Wrap(content)

	userPowerLevel, ok := jsonObj.Search("users", userId).Data().(float64)
	if !ok {
		// Most likely no power level defined for the user, which means the default applies (if there is one).
		
                logger := me.logger.WithField("roomId", roomId).WithField("userId", userId)
                
                defaultVal, ok := jsonObj.Search("users_default").Data().(float64)
		if ok {
			logger.Info("User power level not explicitly defined; falling back to default.")
			return int(defaultVal), nil 
		} else {
			logger.Warn("Failed to determine user's power level and no 'users_default' found in m.room.power_levels event. Returning power level 0.")
			return 0, nil
		}
	}

	return int(userPowerLevel), nil
}

We're happy to open a pull request with the implementation if you're in agreement that this would be a good change.

2. Alternatively/additionally implement configurable log levels:

Introduce a configuration variable that allows users to set the desired verbosity for matrix-corporal as a whole. This would provide the flexibility to ignore recurrent warning level messages.

Thank you for considering this request.