Extend the method as a service to calculate integral values according to EN 410

[christoph-maurer]

Left to do

• Implement the direction hemispherical.
• Save the spectral data of EN 410 and ISO 9050 appropriately.
• Handle the case that there are multiple items in the data array of the input and also handle more complex data sets. For example such that alongside the non-integral values also contain integral values.

At the present moment, you can run for example

query {
    calculateMethod(
        methodId: "285d172c-9bcf-4c57-9be0-ee95651ba7db",
        dataReference:  {
            databaseId: "8a27aa0d-6026-4124-b185-4efd5cead953",
            dataId: "f7a0e4e2-324d-4031-a3de-1d584c9e6f47",
            dataKind: OPTICAL_DATA,
            dataTimestamp: "2019-09-01T12:00:00+01:00"
    }) {
        result
        errors {
            code
            message
            path
        }
    }
}

to calculate the integral values.

For preliminary work see #74 and #79

[christoph-maurer]

We work on this topic in #51 .