F6: USB glue cleanup and fixes

[DrZlo13]

What's new

• F6: proper USB-CDC integration with furi-hal-vcp, fix lost data on buffer overflow
• F6: USB code cleanup and move to usb-glue folder
• F6: USB Descriptor adjustments: power, CDC and endpoint sizes
• F6: USB smaller buffers
• F6: bootloader keeps USB lines pulled to GND till startup complete
• Cli: fix missing motd with minicom

Verification

• Compile and upload bootloader and firmware
• Send a large block of data (> 600b) to cdc, you should see an echo of all data
• Check on reboot USB behavior. Bus should be properly reseted
• USB disconnect on screen streaming doesn't cause lockups anymore
• Minicom now doesn't skip motd

Checklist (do not modify)

• PR has description of feature/bug or link to Confluence/Jira task
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix