Add USB Printer support

[kidbomb]

What's new

• Adds support for USB Printer class

Verification

• Open printer_test application
• Connect USB to computer
• Add new USB printer
• Send print job
• Flipper Zero should show a status like below:

Checklist (For Reviewer)

• 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

[xMasterX]

Hi, this looks like great idea for external app, why it was implemented in furi_hal ? some API was not exposed? or theres a other reason?

[kidbomb]

Hi, this looks like great idea for external app, why it was implemented in furi_hal ? some API was not exposed? or theres a other reason?

Correct - Furi HAL was missing the Printer USB class implementation, which handles sending all necessary descriptors to the host