[gql] resolve event relationships under a point

[mikeldking]

Extend the UMAP points to resolve relationships

type UMAPPoints {
     ....
     relationships: [Relationship]
}

type Relationship {
     name: String! // something like retrieval
     connections: [RelationshipConnection]!
}

type RelationshipConnection {
    ids: [ID!, ID!]!
    similarity: number # Future way of creating a weighted graph based on a heuristic 
}