WIP: Fitting for wideband datasets in the presence of correlated noise #4764

Job	Run time
macos-latest-py313	59m 25s
ubuntu-latest, ephemeris_connection	1m 16s
ubuntu-latest, black	27s
ubuntu-latest, py313-test-cov	1h 33m 44s
ubuntu-latest, notebooks	5m 37s
ubuntu-latest, oldestdeps	30m 6s
	3h 10m 35s

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