arrow-row: create rowparser whilst disabling utf8 validation #10275

Is your feature request related to a problem or challenge?

I think now that validate_utf8 is a somewhat rare code path in the Rows code as it happens after externalizing the Rows to bytes and then parsing them back (I understand this after messing with #10259)

Since most systems are likely going to be parsing row data back from trusted sources (itself, for example) maybe we could just offer an unsafe API on RowParser to simply trust the data (and skip the utf8 check entirely)

This will probably make things faster even than this optimized utf8 check 🤔

• Validate short view strings in separate buffer in arrow-row #10250 (comment)

Describe the solution you'd like

have an api on RowParser to create an instance but with utf8 validation flag turned off; probably needs to be an unsafe function

Describe alternatives you've considered

No response

Additional context

No response