Fixes build issues and adds mypy stubs

[bnlerner]

Changes:

• First is compiling using older version of linux/can which use frame.can_dlc vs the newer frame.len. Checks this by compiling using can_dlc then opts to use can_dlc in relevant functions like utilities and node if so (so backwards compatible with the change from can_dlc -> len)
• Second is adding a more dynamic way to search for pybind11 when building the wheel as several problems seen during builds.
• Third is completes the python c++ binding by adding a mypy .pyi file so type hints and type checking show up correctly.

[2b-t]

Hi Brian,
Sorry for the delay. I am currently in the process of relocating and do not have access to my actuator to test the pull request. I should be able to test it in a few days!