Add exception when trying to create large strings with cudf::test::strings_column_wrapper

[davidwendt]

Description

Throws an exception in the cudf::test::strings_column_wrapper if the column size (accumulated offset values) would exceed max size_type.
Large strings created by the wrapper are not supported and discouraged due to the size and time impact on testing and CI.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[davidwendt]

/merge