refactor: migrate to LineSearch.jl #102

Job	Run time
test (Core, min, ubuntu-latest)	14m 37s
test (Core, min, macos-latest)	14m 40s
test (Core, min, windows-latest)	14m 33s
test (Core, 1, ubuntu-latest)	14m 38s
test (Core, 1, macos-latest)	14m 41s
test (Core, 1, windows-latest)	14m 34s
test (Downstream, min, ubuntu-latest)	10m 31s
test (Downstream, min, macos-latest)	10m 32s
test (Downstream, min, windows-latest)	14m 12s
test (Downstream, 1, ubuntu-latest)	9m 35s
test (Downstream, 1, macos-latest)	7m 9s
test (Downstream, 1, windows-latest)	12m 8s
test (Misc, min, ubuntu-latest)	13m 38s
test (Misc, min, macos-latest)	4m 54s
test (Misc, min, windows-latest)	14m 29s
test (Misc, 1, ubuntu-latest)	11m 55s
test (Misc, 1, macos-latest)	9m 52s
test (Misc, 1, windows-latest)	14m 29s
test (Wrappers, min, ubuntu-latest)	11m 8s
test (Wrappers, min, macos-latest)	3m 57s
test (Wrappers, min, windows-latest)	14m 29s
test (Wrappers, 1, ubuntu-latest)	9m 59s
test (Wrappers, 1, macos-latest)	4m 29s
test (Wrappers, 1, windows-latest)	13m 16s
	4h 38m 25s

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