Gets a range from the buffer.

This differs from nvim_buf_get_lines() in that it allows retrieving only portions of a line.

Indexing is zero-based. Row indices are end-inclusive, and column indices are end-exclusive.

Prefer nvim_buf_get_lines() when retrieving entire lines.

Parameters:

• {buffer} Buffer handle, or 0 for current buffer
• {start_row} First line index
• {start_col} Starting column (byte offset) on first line
• {end_row} Last line index, inclusive
• {end_col} Ending column (byte offset) on last line, exclusive
• {opts} Optional parameters. Currently unused.

Return: Array of lines, or empty array for unloaded buffer.