appendValues uses an A1 range to detect a logical table and appends after its
last data row or column.
Example
Inputs
spreadsheet, detection range, and non-empty values matrix are required.
majorDimension defaults to rows; inputMode defaults to userEntered.
insertMode defaults to insertRows; overwrite can write over cells after
the detected table. includeValues defaults false; response render modes match
Write values.
account optionally selects the Google account binding.
Output
ReturnsspreadsheetId, optional pre-append tableRange, updatedRange,
updated counts, and optional returned values. The detection range identifies a
logical table; it is not necessarily the exact appended range.