Add canardRxAccept2(), fix #163

[pavel-kirienko]

• Fix #163
• Update Clang-Tools to v11:
  • More consistent autoformatting (hide whitespace changes to declutter the diff)
  • New checks in clang-tidy
• Remove redundant declarations before static functions by improving the build flag handling in the test suite
• CI broke due to external factors; this PR fixes it
• Bump minor version number

Backward compatibility not affected

Context https://forum.uavcan.org/t/libcanard-calling-canardrxaccept-handler-in-o-1-time/1257

[PetervdPerk-NXP]

Hi @pavel-kirienko I've added tests here

https://github.com/PetervdPerk-NXP/libcanard/tree/163_tests

And made a test implementation in PX4 which seems to be working fine.

[pavel-kirienko]

@PetervdPerk-NXP Great! Can you please cherry-pick your extra commit here? You have push access to this repo (and others).

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