Calculate dividends based on load excel spreadsheet and display values

[CleberRangel]

Acceptance Criteria

• For now, we will consider that the excel sheet has data for only the current taxable year (a year prior to the current)
• no data for multiple years should be calculated
• The result should be displayed in the current field in the UI
• For each stock selected the values need to be recalculated
• Average price needs to be calculated from the rows that have the Movimentação as Dividendo and the value for each comes from column Preço unitário x Quantidade