Multi-key src/dst shapings ignore all keys after the first

[lmeyerov]

When multiple fields are put in for the src/dst, only the first is used

Ex: src = [ VP, Region ] should cause nodes like (Jane, USA) but instead only creates node Jane

[dess890]

lines 47-52 needs to be removed in capabilities.json
"drilldown": { "roles": [ "Source", "Target" ] },

[dess890]

need to implement .filter and map instead of .find in visual.ts

line 160
const srcColMetadata = view.metadata.columns.find((c) => c.roles.Source);

line 163
const dstColMetadata = view.metadata.columns.find((c) => c.roles.Destination);