[FEAT] Add Unity Catalog support

[jaychia]

1. Adds a new daft.io.UnityCatalog class
2. Adds some basic methods on that class, only implements list_schemas, list_tables and load_tables right now
3. Adds integrations with daft.read_delta_lake to make this work
4. Ensure that the io_config is correctly propagated by requesting credentials from unity catalog

[codecov]

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Additional details and impacted files

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Files	Coverage Δ
daft/io/_delta_lake.py	72.22% <36.36%> (ø)
daft/io/unity_catalog.py	28.07% <28.07%> (ø)

[samster25]

we can prob make this a generic util function that creates an iterator from a method / function using this paradigm

[jaychia]

Nice, done

[djouallah]

what would be really cool if you can add daft.read_table(table).show(), I don't needs to know if it is delta/iceberg or something else, daft can figure out which table format it is :)

[jaychia]

@djouallah that's a great idea!