Keep directory and use to infer write location

[delucchi-cmu]

Change Description

When loading partition info from a directory (which is what we do when we load from Catalog API), keep the catalog base directory for later use when writing out the files. We can infer the desired location, and construct paths on behalf of the user.

[github-actions]

Before [c2e8bfd]	After [c2df54e]	Ratio	Benchmark (Parameter)
123±0.4ms	125±0.9ms	1.02	benchmarks.time_test_alignment_even_sky
98.9±1ms	98.6±0.7ms	1	benchmarks.time_test_cone_filter_multiple_order
82.0±1ms	81.1±0.3ms	0.99	benchmarks.MetadataSuite.time_load_partition_join_info
652±5ms	642±8ms	0.99	benchmarks.Suite.time_pixel_tree_creation
82.1±0.6ms	80.6±0.3ms	0.98	benchmarks.MetadataSuite.time_load_partition_info_order7
20.4±0.4ms	19.7±0.2ms	0.97	benchmarks.MetadataSuite.time_load_partition_info_order6

Click here to view all benchmarks.

[camposandro]

I detected a missing argument in the docstrings, other than that it looks good!