Auto mode and export/read option for the geo nodes Bake node.

It would be nice to have the bake node automatically re-bake if any downstream values change from what they were when last baked. That way they could be placed where needed and forgoten about, and also packaged with addons without the need for user intervention.

All external data sources relied on throughout the node tree could be hashed during baking (such as incoming geometry state, values from group inputs or drivers), and then trigger upstream bake nodes to re-bake when the hash changes.

This should be optional by adding an 'Auto' checkbox to the node.

Also useful would be an 'Export' checkbox and a 'format' dropodwn, which will cause the node to also export to the selected format (obj, fbx, usd, alembic, etc) whenever it re-bakes. The export settings for each format could use those last used when exporting from the file menu, or be overridden from the n panel on a per modifier basis.

Additionally a 'read only' option, which could import a file into the node tree, for example a vdb, fbx, obj, alembic, etc. This would make it possible to process external files directly in geometry nodes without manual import, good when external files are being modified in other 3d software. Many tasks could be automated by having a bake node set to read, then nodes to modifiy the geometry, followed by an bake node set to auto to spit it back out ready for colleagues to continue working on in Blender or other software.