WIP: Fitting for wideband datasets in the presence of correlated noise #4732

Job	Run time
macos-latest-py313	1h 6m 42s
ubuntu-latest, ephemeris_connection	1m 6s
ubuntu-latest, black	25s
ubuntu-latest, py313-test-cov	1h 30m 57s
ubuntu-latest, notebooks	5m 1s
ubuntu-latest, oldestdeps	28m 21s
	3h 12m 32s

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