809fed764a
This exposes warnings that are propagated to the modifier in the Python API.
This allows people to show these warnings in custom UIs for their node groups.
Warnings are accessed like this:
```python
for warning in modifier.node_warnings:
print(warning.message)
print(warning.type)
```
Note that this only works on the geometry nodes modifier. These warnings may
be extended with more information in the future. E.g. it could be useful to know
which node created the warning.
Pull Request: https://projects.blender.org/blender/blender/pulls/127193
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