Add type annotations to indexable extension code #12763
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A typing test case (plain_files/ext/indexable.py) is also added.
In order to make the methods of index_property conform with type definitions of
fget
,fset
andfdel
arguments of hybrid_property, we need to make the signature of protocols (e.g._HybridGetterType
)__call__
) method positional only.Related to #6810.