Add sorted maps and sets

[jeaye]

Clojure has sorted-map, which builds a PersistentTreeMap, and sorted-set, which builds a PersistentTreeSet. immer doesn't support these, but there's some good info here: arximboldi/immer#105

jank will need its own version, but hopefully we can benefit from the stdlib.

Overall, since we have hash maps, array maps, and hash sets, I think the sorted variants are low priority.

[jeaye]

❯ git ls-files | grep sorted
compiler+runtime/include/cpp/jank/runtime/obj/persistent_sorted_map.hpp
compiler+runtime/include/cpp/jank/runtime/obj/persistent_sorted_map_sequence.hpp
compiler+runtime/include/cpp/jank/runtime/obj/persistent_sorted_set.hpp
compiler+runtime/include/cpp/jank/runtime/obj/persistent_sorted_set_sequence.hpp
compiler+runtime/include/cpp/jank/runtime/obj/transient_sorted_map.hpp
compiler+runtime/include/cpp/jank/runtime/obj/transient_sorted_set.hpp
compiler+runtime/src/cpp/jank/runtime/obj/persistent_sorted_map.cpp
compiler+runtime/src/cpp/jank/runtime/obj/persistent_sorted_set.cpp
compiler+runtime/src/cpp/jank/runtime/obj/transient_sorted_map.cpp
compiler+runtime/src/cpp/jank/runtime/obj/transient_sorted_set.cpp