feat(examples): websocket autobahn test suit integration (IDF-14864)

[gabsuren]

Note

Adds an Autobahn testsuite example (with scripts/configs and testee client) and CI workflows to build/run Linux tests and build target binaries, plus minor logging and linux_compat tweaks.

• Examples (esp_websocket_client/autobahn-testsuite):
  • Add full Autobahn testsuite setup: docker-compose.yml, config/*, scripts/* (summary/analyze/serial monitor/quick-restore), and run_tests.sh.
  • New testee project (Linux/ESP32): CMake/Kconfig, idf_component.yml, CI sdkconfigs, and main/autobahn_testee.c implementing echo client with fragmentation handling, stdin URI support, and report updates.
• CI:
  • Add /.github/workflows/autobahn__linux-test.yml to start fuzzing server, build Linux testee, run tests, generate/upload reports.
  • Add /.github/workflows/autobahn__target-test.yml to build and package ESP32 testee binaries (run-on-target job scaffolded but commented).
• WebSocket Client (components/esp_websocket_client/esp_websocket_client.c):
  • Harden error logs by null-checking esp_err_to_name(...) in write/read/connect/poll paths.
• Linux Compat (common_components/linux_compat/esp_timer):
  • CMake now REQUIRES esp_common; header includes esp_err.h.

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