Bug: querying for row word data twice now

[willeppy]

Issue

In RowView, the getWordSpans function is called twice on updates

1. First when selection map updates
2. Then again when data updates (the textData prop)

This means double the queries are getting executed.

Hard to fix this in the row itself because needs both these dependencies

Possible fixes

I think to fix will need to get all the word data at once rather than from each row on render. To do this can either

1. Subscribe to the $data store in DataDisplay.svelte and when it updates, check if I need to fetch new word data and get it for all the rows at once (then filter down to pass as prop to each row)
2. Is probably best to do this in the TableClient when new data is fetched, but not totally sure how to do this
3. Probably will also want to execute as arrow since returned table will be kind big