Add validation for MemoryViz compatible JSON

[leowrites]

When using MemoryViz with an incompatible JSON, such as when a field is missing, MemoryViz may crash.

In this example, type is missing

[{
    id: 19,
    value: "type is missing",
    style: ["highlight"],
}]

It would be nice if there are validations to handle these cases and give more descriptive error messages, such as: Error: "type" is missing while drawing a primitive object.