WIP: Fitting for wideband datasets in the presence of correlated noise #4736

Job	Run time
macos-latest-py313	1h 3m 43s
ubuntu-latest, ephemeris_connection	1m 5s
ubuntu-latest, black	25s
ubuntu-latest, py313-test-cov	1h 29m 49s
ubuntu-latest, notebooks	5m 8s
ubuntu-latest, oldestdeps	28m 27s
	3h 8m 37s

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