Reusing Field objects causes unexpected failure

[lundybernard]

Reusing a pandera.Field instance in a DataFrameModel definition causes unexpected behavior and an unhelpful error message.
If the same Field instance is assigned to two attributes, the first attribute will be dropped from the model. This should raise an exception when the model is built, but will only raise an error when validation fails.

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of pandera.
• (optional) I have confirmed this bug exists on the main branch of pandera.

Code Sample, a copy-pastable example

from pandera import DataFrameModel, Field
from pandas import DataFrame

# This Fails
# Attempt to create a field instance to be reused on multiple fields
GenericField: float = Field(ge=0)

class BadModelDF(DataFrameModel):
    field: float = GenericField
    field_1: float = GenericField  # Bug: this is breaks the model
    
    class Config:
        strict = True

# Works
# Workaround, create a new Field object for each model field
def generic_field() -> Field:
    return Field(ge=0)

# This creates a valid model that works as expected
class GoodModelDF(DataFrameModel):
    field: float = generic_field()
    field_1: float = generic_field()
    
    class Config:
        strict = True
        
df = DataFrame({'field': [0.0, 0.1], 'field_1': [0.2, 0.3]})

print(GoodModelDF(df))

# Raises SchemaError 
BadModelDF.validate(df)

Raises: SchemaError: column 'field' not in DataFrameSchema {'field_1': <Schema Column(name=field_1, type=DataType(float64))>}

Expected behavior

Reusing the GenericField instance should result in a valid model/schema that includes both field and field_1 columns.

OR

Assigning the same instance to multiple field attributes should raise an expressive exception when the class is created.

Ex:

class BadModelDF(DataFrameModel):
    field: float = GenericField
    field_1: float = GenericField  # Bug: this is breaks the model

Raises:
AttributeError: Field instances cannot be used for multiple columns. GenericField<pandera.api.dataframe.model_components.FieldInfo("None") object at 0x7fd460386490> assigned to 'field' and 'field_1' attributes for BadMdelDF

Desktop (please complete the following information):

• OS: [Ubuntu]
• Version: [e.g. 22.04]