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feat: Omit Columns from SQL statements (e.g uuid columns) #802

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I've added two options for omitting columns from the SQL statements, to avoid having to modify class level self.ignored_columns since we've had issues with this affecting other code that runs at the same time. These options work as follows:

Omit the guid column from SQL statement, allowing it to generate the uuid and not be forced to NULL:
Model.import(values, omit_columns: [:guid])

Allow per-model decisions, e.g for recursive imports:
Model.import(values, omit_columns: -> (model, column_name) { [:guid] if model == Model })

Use a hash instead of a proc:
Model.import(values, omit_columns: { Model => [:guid] })

The second option is :omit_columns_with_default_functions boolean, to automatically find columns that have a default function declared in the schema, and omit them by default.

I've added two options for omitting columns from the SQL statements, to avoid having to modify class level `self.ignored_columns` since we've had issues with this affecting other code that runs at the same time. These options work as follows:

`Model.import(values, omit_columns: [:guid])` # Omit the guid column from SQL statement, allowing it to generate
`Model.import(values, omit_columns: -> (model, column_name) { [:guid] if model == Model })` Allow per-model decisions, e.g for recursive imports
`Model.import(values, omit_columns: { Model => [:guid] })` Use a hash instead of a proc

The second option is `:omit_columns_with_default_functions` boolean, to automatically find columns that have a default function declared in the schema, and omit them by default.

fix: Require AR 5.0+
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