feat: support gd32vw55x

[kaidegit]

test:

$ uv run python -m stm32loader -V --port /dev/cu.wchusbserial840                                                    
Open port /dev/cu.wchusbserial840, baud 115200
Data transfer size updated: 128 bytes
Flash page size updated: 1024 bytes
Activating bootloader (select UART)
*** Command: Get
    Bootloader version: 0x30
    Available commands: 0x0, 0x11, 0x21, 0x31, 0x44, 0x63, 0x73, 0x82, 0x92
Bootloader version: 0x30
*** Command: Get ID
*** Command: Get GD ID
Data transfer size updated: 240 bytes
Flash page size updated: 4096 bytes
Chip ID: 0x504D4837
Chip model: GD32VW553HMQ7
Flash size: 4096 kiB

$ uv run python -m stm32loader --port /dev/cu.wchusbserial840 -b 1000000 -e -w ../stm32loader/ble_app_uart_blink.bin
Activating bootloader (select UART)
Bootloader version: 0x30
Chip ID: 0x504D4837
Chip model: GD32VW553HMQ7
Flash size: 4096 kiB
Performing full erase...
Flash global erase
Extended erase (0x44), this can take ten seconds or more
Write 307064 bytes in 1280 chunks at address 0x8000000...
Writing ████████████████████████████████ 1280/1280