CI: added ESP-IDF component build (closes #1599)

extras/ci/espidf/CMakeLists.txt

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+# ArduinoJson - https://arduinojson.org
+# Copyright Benoit Blanchon 2014-2021
+# MIT License
+
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(example)

extras/ci/espidf/components/ArduinoJson

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+../../../..

extras/ci/espidf/main/CMakeLists.txt

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+# ArduinoJson - https://arduinojson.org
+# Copyright Benoit Blanchon 2014-2021
+# MIT License
+
+idf_component_register(SRCS "main.cpp"
+                       INCLUDE_DIRS "")

extras/ci/espidf/main/component.mk

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+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

extras/ci/espidf/main/main.cpp

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+// ArduinoJson - https://arduinojson.org
+// Copyright Benoit Blanchon 2014-2021
+// MIT License
+
+#include <ArduinoJson.h>
+
+extern "C" void app_main() {
+  char buffer[256];
+  StaticJsonDocument<200> doc;
+
+  doc["hello"] = "world";
+  serializeJson(doc, buffer);
+  deserializeJson(doc, buffer);
+  serializeMsgPack(doc, buffer);
+  deserializeMsgPack(doc, buffer);
+}