Use nest ordering for point_map.fits file.

[delucchi-cmu]

Change Description

Addresses #271 , but may not close the issue fully.

This change explicitly uses NESTED ordering in the healpix map stored as point_map.fits. For files written without an explicit ordering, the metadata indicates "RING". We throw a warning in this case, and just re-read the file using the older method.

Code Quality

• [x] I have read the Contribution Guide
• [x] My code follows the code style of this project
• [x] My code builds (or compiles) cleanly without any errors or warnings
• [x] My code contains relevant comments and necessary documentation

Bug Fix Checklist

• [x] My fix includes a new test that breaks as a result of the bug (if possible)
• [ ] My change includes a breaking change
  • [ ] My change includes backwards compatibility and deprecation warnings (if possible)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.68%. Comparing base (251c13d) to head (1d3a740).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #273 +/- ## ========================================== + Coverage 93.66% 93.68% +0.01% ========================================== Files 57 57 Lines 1973 1979 +6 ========================================== + Hits 1848 1854 +6 Misses 125 125 ```

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Before [251c13d0]	After [3acaaed0]	Ratio	Benchmark (Parameter)
80.3±2ms	81.3±2ms	1.01	benchmarks.Suite.time_paths_creation
122±1ms	123±0.5ms	1.01	benchmarks.time_test_alignment_even_sky
996±8μs	992±4μs	1	benchmarks.time_test_cone_filter_multiple_order
77.4±1ms	76.6±0.6ms	0.99	benchmarks.MetadataSuite.time_load_partition_info_order7
13.1±0.3ms	13.0±0.2ms	0.99	benchmarks.Suite.time_inner_pixel_alignment
362±4ms	359±2ms	0.99	benchmarks.Suite.time_outer_pixel_alignment
39.5±1ms	39.3±2ms	0.99	benchmarks.Suite.time_pixel_tree_creation
18.3±0.4ms	18.0±0.08ms	0.98	benchmarks.MetadataSuite.time_load_partition_info_order6
77.7±0.5ms	76.5±0.2ms	0.98	benchmarks.MetadataSuite.time_load_partition_join_info

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