Added support for configurable logging on the ESP32 platform. (#10)

Because the ESP-IDF supports [runtime log level control](https://docs.espressif.com/projects/esp-idf/en/v5.5.2/esp32s3/api-reference/system/log.html#log-level-control), SystemK required some tweak to take full advantage of this.

This PR makes the following changes to SystemK:
- On the ESP32 platform, the highest logging level *compiled in* to the app is now controlable by Kconfig, as "SystemK maximum log level".
- [Protocols.c](272618d49d/Protocols/Protocols.c) was refactored, and the `DEBUG_PACKET_[EN/DE]CODE` #defines were renamed to make it clear that they now only apply to the PSoC platform.
- Some decoding warnings in the Test Protocol were downgraded to debug, since they were a nuisance most of the time.

Co-authored-by: Joe Kearney <joe@clubk.club>
Reviewed-on: #10

CMakeLists.txt

@@ -72,3 +72,10 @@ idf_component_register(
         "Settings"
         "States"
 )
+
+# This ensures LOG_LOCAL_LEVEL is defined before any header files are included.
+idf_build_set_property(COMPILE_DEFINITIONS 
+    "-DLOG_LOCAL_LEVEL=${CONFIG_SYSTEMK_LOG_LEVEL}"
+    APPEND
+)
+