WIP: Fitting for wideband datasets in the presence of correlated noise #4766

Job	Run time
ubuntu-latest, ephemeris_connection	1m 46s
macos-latest-py313	1h 34m 26s
ubuntu-latest, black	25s
ubuntu-latest, py313-test-cov	1h 30m 4s
ubuntu-latest, notebooks	5m 4s
ubuntu-latest, oldestdeps	28m 28s
	3h 40m 13s

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