Inconsistent defaults for `HttpClientConfiguration`

[at055612]

In the no-args ctor we have

        timeout = StroomDuration.ofMinutes(3);
        connectionTimeout = StroomDuration.ofMinutes(3);
        connectionRequestTimeout = StroomDuration.ofMinutes(3);

but in the JsonCreator ctor we have

        this.timeout = Objects
                .requireNonNullElse(timeout, StroomDuration.ofMillis(500));
        this.connectionTimeout = Objects
                .requireNonNullElse(connectionTimeout, StroomDuration.ofMillis(500));
        this.connectionRequestTimeout = Objects
                .requireNonNullElse(connectionRequestTimeout, StroomDuration.ofMillis(500));

Both should be using the same default value so there is no ambiguity over which default is used.