* feat: Add up and down button drawing functions to GUI elements
Two button drawing functions, elements_button_up and elements_button_down, have been added to the GUI elements. These functions allow a button to be drawn at the top left and top right corner of the canvas respectively, with an accompanying string and icon. The underlying layout and design of these buttons is defined within these functions.
* feat: Add null checks for Canvas parameter in button functions
Added furi_check to ensure the Canvas parameter is not null in elements_button_up and elements_button_down functions. This prevents potential crashes due to dereferencing a null pointer.
Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>
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