Multi Volume Support - LVGL Media Select Screen

[rhapsodyv]

Description

This PR makes marlin working with Multiples volumes at same time. Currently, it can be only used with boards that support usb flash drive + onboard SD.
I have added the media select screen to the LVGL UI too.

All volumes can be shared with the host too.

It's the first version. I have chosen to not change Card class/object to make it non-static. I had preferred to make the underline IO Driver selectable, but keeping only one static card object.
If we make card a multi-object, we need to change all gcode that use it, to allow a volume selection. And this is big rewrite that don't worth the work right now, as only one board will be capable of using this feature!

In a future implementation, I may adopt FatFS (that I have working to integrate it with Marlin too), that has easier and standard support for multi volume.

Video of this feature: https://twitter.com/Victor40545450/status/1368340554224967682

TODO list:

• Option for the user select which media share with host, at runtime
• Rename the Sd2Card files to the name of the classes (I will to it only after everything was reviewed and ready to merge, to avoid nasty git conflicts generated by moved file)

Requirements

MKS Nano V3 Board
LVGL UI

Benefits

Users don't need to recompile Marlin to chose the media they want to use.

Configurations

#define SERIAL_PORT -1
#define SERIAL_PORT_2 3
#define MOTHERBOARD BOARD_MKS_ROBIN_NANO_V3
#define SDSUPPORT
#define MKS_TS35_V2_0
#define TFT_LVGL_UI

#define USB_FLASH_DRIVE_SUPPORT
#define USE_OTG_USB_HOST
#define MULTI_VOLUME
#define VOLUME_SD_ONBOARD
#define VOLUME_USB_FLASH_DRIVE
#define DEFAULT_VOLUME SD_ONBOARD
#define DEFAULT_SHARED_VOLUME USB_FLASH_DRIVE