Add feature to setup price movement alarms

[beeb]

This feature would allow the user to set a price movement alarm for each token, whereby a telegram message would be issued if the price moves up or down by a certain percentage compared to the last reported value.

When a notification is issued, the current price is used as the new reference for monitoring the price change. When the price moves up or down again by the given percentage, a new notification is issued.

If the token has a "price at buy" value, the notification can include the current profit/loss compared to buying price in the notification.