ESP-IDF support

ports/esp-idf/CMakeLists.txt

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+file(GLOB_RECURSE COMPONENT_SRC "src/*.c")
+set(COMPONENT_ADD_INCLUDEDIRS "src")
+set(COMPONENT_DEFINES "PS_SYNC_CUSTOM;PS_SYNC_FREERTOS;PS_DEPRECATE_NO_PREFIX")
+idf_component_register(
+                    SRCS ${COMPONENT_SRC}
+                    INCLUDE_DIRS ${COMPONENT_ADD_INCLUDEDIRS}
+)
+
+if(PUBSUB_NO_PREFIX)
+list(REMOVE_ITEM COMPONENT_DEFINES "PS_DEPRECATE_NO_PREFIX")
+endif()
+
+target_compile_definitions(${COMPONENT_LIB} INTERFACE ${COMPONENT_DEFINES})

ports/esp-idf/Kconfig

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+menu "pubsub-c"
+    config PUBSUB_NO_PREFIX
+        bool "allow naked macro and function names."
+        default n
+        help
+            "Generate naked macro and function names without a prefix."
+endmenu

ports/esp-idf/README.md

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+# ESP-IDF component
+
+In your ESP-IDF project, edit your `idf_component.yml`:
+
+```yaml
+dependencies:
+  pubsub-c:
+    git: https://github.com/jaracil/pubsub-c
+    version: "*"
+    path: ports/esp-idf
+```
+
+and add `pubsub-c` to your main `CMakeLists.txt`:
+
+```cmake
+idf_component_register(
+  SRCS ${SRC} 
+  REQUIRES pubsub-c
+)
+```
+
+The [Component Manager](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html) will automatically download pubsub-c, and make it available to your project.

ports/esp-idf/idf_component.yml

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+dependencies:
+  cmake_utilities: '*'
+  idf: '>=5.0'
+description: Publish and Subscribe bus
+documentation: https://github.com/jaracil/pubsub-c
+issues: https://github.com/jaracil/pubsub-c/issues
+repository: git://://github.com/jaracil/pubsub-c.git
+repository_info:
+  path: "ports/esp-idf"
+url: https://github.com/jaracil/pubsub-c

ports/esp-idf/src

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+../../src