InputRichBlockButtons
A block containing a list of buttons that are shown in one row, corresponding to the custom HTML tag <tg-button-row>.
Fields
typeString = buttonsRequiredType of the block, always "buttons"
List of 1-8 buttons to send
alignStringOptionalValues:
leftcenterrightOptional. Horizontal alignment of the buttons. Currently, must be one of "left", "center", or "right".