add method to split text into columns

## Overview
Add method to split text from a single column into multiple columns.

## Details
The api provide a way to split text from a single column into multiple columns: [sheet API v4](https://developers.google.com/sheets/api/reference/rest/v4/spreadsheets/request#texttocolumnsrequest)

This will be very useful when importing text into a worksheet and then splitting it into columns (like from a csv data source)

expose necessary methods to split text into columns.