Wait for indexing to be done before returning data

[gmaclennan]

Description

Any read operations on data types (e.g. project.observations.getMany() should wait until all available data has been indexed before returning data. This is particularly important on first start of the app with unindexed data.

One way to implement this is to add a dataType.onIndexIdle() function. It should wait for the cores in the dataStore namespace to be ready() first, then wait a tick so that indexing can start, then if the index state is not idle, wait until it is idle. Either that or we should set the initial index state to indexing, and set to idle once the core is ready and we know there is no data.

Tasks

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