Catalog API update 5: dataset query

[abey79]

Related

• part of https://linear.app/rerun/issue/RR-2901/pr-tracking-clean-up-cloud-apis-project

What

TODO

Implementation note:

• The DataframeQueryViewProvider-related code now lives in DatasetView, with Dataset.reader() delegating to DatasetView.reader().
• This still uses the OLD semantics for using_index_values, aka. a list of index value that are applied equally to every single selected segment. Moving to the new semantics (mapping of segment id -> list of index values) requires changes to the DataframeQueryTableProvider, so that's for the next PR.
• This PR doesn't yet implement get_index_range on Dataset/DatasetView

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