Draft: `ImplicitDiscreteSolve` #496

Job	Run time
test (core, 1.10, ubuntu-latest)	7m 28s
downgrade (1.10, core)	17s
test (core, 1.10, macos-latest)	4m 44s
test (core, 1, ubuntu-latest)	12m 24s
downgrade (1.10, downstream)	19s
test (core, 1, macos-latest)	9m 27s
downgrade (1.10, wrappers)	20s
test (downstream, 1.10, ubuntu-latest)	7m 25s
downgrade (1.10, misc)	17s
test (downstream, 1.10, macos-latest)	4m 56s
test (downstream, 1, ubuntu-latest)	12m 16s
test (downstream, 1, macos-latest)	7m 28s
test (wrappers, 1.10, ubuntu-latest)	7m 35s
test (wrappers, 1.10, macos-latest)	3m 44s
test (wrappers, 1, ubuntu-latest)	11m 58s
test (wrappers, 1, macos-latest)	1m 44s
test (misc, 1.10, ubuntu-latest)	7m 26s
test (misc, 1.10, macos-latest)	4m 44s
test (misc, 1, ubuntu-latest)	12m 11s
test (misc, 1, macos-latest)	5m 36s
	2h 2m 19s

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