Add nooz

newsfragments/257.feature.rst

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+Add ``trionics.maybe_open_context()`` an actor-scoped async multi-task
+context manager resource caching API.
+
+Adds an SC-safe cacheing async context manager api that only enters on
+the *first* task entry and only exits on the *last* task exit while in
+between delivering the same cached value per input key. Keys can be
+either an explicit ``key`` named arg provided by the user or a
+hashable ``kwargs`` dict (will be converted to a ``list[tuple]``) which
+is passed to the underlying manager function as input.