Introduce thrift format for ingest

Definitely some questions around this - opening it up for discussion
>>
>> This isn't a NamespacedThriftFact it should be an ingestion fact of some
sort
>
> This is the ingestion format (with the same name). Right, so as per my
previous question it sounds like we definitely don't need namespace.

Ah, sorry, I totally missed that it wasn't the same one. But yeah don't
need namespace, it comes from CLI or on disk paths.

>
> I didn't quite get how the time dimension is different. Is it not just
date + optional time?

That is what it is. I misread this bit of code thinking it was the other
thrift fact.

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