feat: to_interval for Snowflake backend

[mohelm]

What happened?

With the Snowflake backend I get an OperationNotDefinedError error

when doing

t.mutate(new_time=t["old_time"] - t["some_integer"].to_interval(unit="D")) 

Here "old_time" is a timestamp column and "some_integer" is a column containing integer values. t is a table. I think the to_interval operation is not implemented for SF.

What version of ibis are you using?

latest - 9.2 i believe.

What backend(s) are you using, if any?

Snowflake.

Relevant log output

I get a `OperationNotDefinedError` not defined error.

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