Agent toolbox: stock data tool

Make sure to first run the cell to install the libraries

• Create a tool called stock_data_tool() that takes a stock ticker symbol (company_ticker) and number of days to look back over (num_days), and returns a markdown-formatted table containing the stock performance data of that company over that period.
• Invoke the tool on "META" over 4 days to test that it works—note that the table only contains business days, so the number of rows can be less than num_days.