Writing CSV files With Column Widths Greater Than 255 Characters to Blob Storage

Trying to write a .csv file to blob with the `storage_write_csv()` function, when one or more columns had >255 characters causes RStudio to crash.

In digging through the internal code of `storage_write_csv()` I discovered that there are two versions of it -- `storage_write_csv_base()` and `storage_write_csv_readr()`. The first function causes the write to fail and RStudio to crash. However, if the `readr` package in installed and loaded, it will use the second function, which doesn't have an issue with the wide columns.

Might be worth documenting that somewhere. Thanks!