✨ Add field support for bionty base

[Zethson]

Fixes https://github.com/laminlabs/lamindb/issues/2096

• We now infer a string representation if Bionty is running in bionty-base mode aka when .public() was accessed This enables

bt.Gene.public().validate(df["Gene Symbol"], field=bt.Gene.symbol, organism="human")

to work which would earlier error with KeyError: 'FieldAttr(Gene.symbol)'.

[github-actions[bot]]

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