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Make hash and sorted map apis consistent (#1976)

* implement hashmap::contains

* rename sorted_map::lookup to find, making it consistent with hashmap

* implement hashmap::elems

* implement hashmap::filter

* implemented fold and fold_with_key

* implemented keys, map and map_with_key

* implemented ingleton and to_array

* implemented sorted_map::union

* added documentation for new public functions

* make fold_with_key tailrecursive

* remove array allocation from filter

* add test for overflow edge case, as suggested in review

* fix formatting and docs

* mitigate potential infinite loop

* pre-allocate array with known size

* rename back to lookup as suggested

* remove union from sorted_map

* functions keys and elems returning Iter instead of Array

* deprecate hashmap:find and introduce lookup

* fix docs

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