omry / omegaconf / ffc2fcb5-f8ba-4a30-abfe-d2b5be80c94f

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Fix structured config container forward refs on Python 3.10 and older

Python 3.10 and older can represent built-in container forward
references like list["Tree"] differently from newer versions, leaving
string-based element types unresolved inside structured configs. This
caused OmegaConf.structured() to fail with a ValidationError for
forward references inside containers.

Handle string-based forward references in _resolve_forward() and allow
_get_class() to resolve dotted nested class paths such as
"HasForwardRef.CA". Add regression tests for both simple and dotted
container forward references.

Closes #1174

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