Add socketcan and python-can support to panda #2130
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This allows one to use a whole ecosystem of oss tools for canfd analysis like CaringCaribou. This impl also includes a simple bidi relay to socketcan. This is useful on C3X which isn't supported by socketcan kernel driver.
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This provides a bidi connection between Panda and socketcan (and/or python-can).
My initial motivation was to use some opensource tools for discovery, fuzzing, and analysis of higher level CAN msg protocols. The existing socketcan driver doesn't support SPI Panda, and this is 1/4 the size of a kernel driver.
I'm opening this as a draft to solicit early feedback. If there's interest, I'll add cmdline args and threaded msg passing before moving out of draft.