Implementation of the power spectrum inference with GPs #1871

Job	Run time
check_commit	7s
ci-tests (Black test, ubuntu-latest, 3.10, black, false)	18s
ci-tests (Py3.8 with old Astropy version, ubuntu-latest, 3.8, py38-test-astropy4-cov, false)	2m 15s
ci-tests (Linux, Py3.10 with coverage, ubuntu-latest, 3.10, py310-test-cov, false)	2m 40s
ci-tests (Windows, Py3.11 with coverage, windows-latest, 3.11, py311-test-cov, false)	3m 32s
ci-tests (Mac OS M1, Py3.11, macos-14, 3.11, py311-test, false)	1m 45s
ci-tests (Mac OS, Py3.11, macos-latest, 3.11, py311-test, false)	1m 40s
ci-tests (Linux, Py3.11 all dependencies and coverage, ubuntu-latest, 3.11, py311-test-alldeps-co...	4m 53s
ci-tests (Linux, Py3.12 basic dependencies and coverage, ubuntu-latest, 3.12, py312-test-cov, tru...	2m 49s
ci-tests (Linux, Py3.11 with dev versions of dependencies, ubuntu-latest, 3.11, py311-test-devdep...	2m 30s
ci-tests (Slow tests on Linux, Py3.11, all deps and coverage, ubuntu-latest, 3.11, py311-test-all...	10m 52s
ci-tests (Slow tests on Linux, Py3.11, basic deps and coverage, ubuntu-latest, 3.11, py311-test-c...	4m 35s
	37m 56s

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