refactor!: move preconditioners inside linear solvers (#485) #255

Job	Run time
downgrade (1.10, core)	15m 57s
downgrade (1.10, downstream)	8m 44s
downgrade (1.10, wrappers)	10m 16s
test (core, 1.10, ubuntu-latest)	15m 33s
test (core, 1.10, macos-latest)	11m 40s
test (core, 1.10, windows-latest)	19m 41s
test (core, 1, ubuntu-latest)	26m 55s
test (core, 1, macos-latest)	15m 36s
test (core, 1, windows-latest)	30m 54s
test (downstream, 1.10, ubuntu-latest)	8m 0s
test (downstream, 1.10, macos-latest)	5m 31s
test (downstream, 1.10, windows-latest)	10m 55s
test (downstream, 1, ubuntu-latest)	17m 3s
test (downstream, 1, macos-latest)	10m 42s
test (downstream, 1, windows-latest)	21m 6s
test (wrappers, 1.10, ubuntu-latest)	9m 35s
test (wrappers, 1.10, macos-latest)	6m 19s
test (wrappers, 1.10, windows-latest)	14m 17s
test (wrappers, 1, ubuntu-latest)	19m 36s
test (wrappers, 1, macos-latest)	17m 42s
test (wrappers, 1, windows-latest)	22m 54s
	5h 18m 56s

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