Implement the calculation of the integral optical values according to EN 410

[christoph-maurer]

When #50 is closed, we can start to implement the calculation of the integral optical values according to EN 410 as a method as a service in graphql.

It would be good to have the option to upload spectral optical data or to use data from the product data network.

[christoph-maurer]

make ARGS='--filter "FullyQualifiedName~SpectralToIntegral"' test

[christoph-maurer]

nahnormal-hemisphärischer Transmissionsgrad	IGSDB_v2 LBNL-JSON	LambdaWork	MaaS intermediate
En410Visible	0.902543604	0.902535827	0.90237896
En410Solar		0.868298055	0.86174667
Iso9050Solar	0.870794058	0.871039573	0.85739063