panda: add unit tests for usb protocol (pack/unpack) (#22955)
* prepare for unit tests
* add to selfdrive_tests.yaml
* test header
* test chunk count
* rename test function
* continue
* don't check chunks count
* test recv_can
* continue
* small cleanup
* merge master
* cleanup
* rename functions
* test different packet size
* fix operator precedence problem
* refactor unpack_can_buffer
* cleanup test
* cleanup unpack_can_buffer
* add test for multiple pandas
* rename to test_panda
* restore test_boardd
* rename to test_boardd_usbprotocol
* fix typo
* bus_offset = [0,4]
* change src
* use USBPACKET_MAX_SIZE
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