readValues reads raw A1 or named ranges in one request. Use row actions when
you want records keyed by headers instead of positional matrices.
Example
Inputs
spreadsheet and one range or non-empty ranges array are required.
majorDimension is rows (default) or columns. valueRender is
unformatted (default), formatted, or formula. dateTimeRender is
serialNumber (default) or formattedString when values are not formatted.
account selects the Google account.
Output
Returns one{ range, majorDimension, values } per requested range. values
is (string | number | boolean | null)[][]; the outer dimension matches
majorDimension. Google omits trailing empty cells and rows, so matrices can be
ragged and shorter than the requested range.