Draft: `ImplicitDiscreteSolve` #500

Job	Run time
downgrade (1.10, core)	15s
test (core, 1.10, ubuntu-latest)	21s
downgrade (1.10, downstream)	15s
test (core, 1.10, macos-latest)	20s
downgrade (1.10, wrappers)	15s
test (core, 1, ubuntu-latest)	56s
downgrade (1.10, misc)	19s
test (core, 1, macos-latest)	35s
test (downstream, 1.10, ubuntu-latest)	30s
test (downstream, 1.10, macos-latest)	23s
test (downstream, 1, ubuntu-latest)	1m 9s
test (downstream, 1, macos-latest)	54s
test (wrappers, 1.10, ubuntu-latest)	23s
test (wrappers, 1.10, macos-latest)	18s
test (wrappers, 1, ubuntu-latest)	1m 9s
test (wrappers, 1, macos-latest)	34s
test (misc, 1.10, ubuntu-latest)	22s
test (misc, 1.10, macos-latest)	19s
test (misc, 1, ubuntu-latest)	1m 3s
test (misc, 1, macos-latest)	45s
	11m 5s

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