Support JuliaDB Backend

[mirestrepo]

How do we feel about this?

[DilumAluthge]

IterableTables supports JuliaDB as both a source and a sink. It also supports DataFrames as both a source and a sink.

So if we add DataFrames support, then we can use IterableTables to get the data from the JuliaDB backend and then pass it to our DataFrames pipeline.

Would probably be easier to do that than implement our own JuliaDB support from scratch.

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