Add Lobatto IIIa-c and Radau IIa solvers #49

Job	Run time
Tests (windows-latest, CPU) / Tests - CPU	44m 31s
Tests (macos-latest, CPU) / Tests - CPU	1h 47m 13s
Tests (ubuntu-latest, CPU) / Tests - CPU	1h 46m 58s
	4h 18m 42s

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