Add support for TSP snapshot request #1194
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This PR adds another request handler for TSP = "typeServer/getSnapshot". The snapshot request is how the client side of a TSP connection indicates which 'state of the world' it's currently querying about. The server side keeps a 'snapshot' to indicate when the state of the world has changed.
Internally I used the 'epoch' and the 'RecheckFinished' event to indicate what the snapshot is and when it's changed.