Add (manually created) enums for intents and context types.

[mattjamieson]

Per #261, adding manually created enums for intents and context types:

let instrumentContext: Instrument = {
  type: ContextTypes.Instrument,
  id: {
    ticker: "GBPUSD"
  }
};

fdc3.raiseIntent(Intents.ViewChart, instrumentContext);

Additional PR to follow to improve typegen to use enum types etc. Will be for 1.2 as it necessitates changes to the schema files.

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[mattjamieson]

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[maoo]

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