update persistence, add more functions

[querdenker2k]

This will add all available persistence functions which are currently available in openHAB core.
The usage is now more like the original usage from the core (return types, parameters, etc).
Some of the methods are optimized for easier usage, but some of them require extra doing as before like sumSince returned a double before. The original openhab persistence function returns an abstract State.
The JRulePersistence provides now

    default Optional<JRuleDecimalValue> sumSinceAsDecimal(ZonedDateTime timestamp, @Nullable String serviceId) {
        return sumSince(timestamp, serviceId).map(v -> (JRuleDecimalValue) v.as(JRuleDecimalValue.class));
    }

    default Optional<JRuleDecimalValue> sumSinceAsDecimal(ZonedDateTime timestamp) {
        return sumSinceAsDecimal(timestamp, null);
    }

    default Optional<JRuleValue> sumSince(ZonedDateTime timestamp) {
        return sumSince(timestamp, null);
    }

    Optional<JRuleValue> sumSince(ZonedDateTime timestamp, @Nullable String serviceId);