feat(dns): Add ESP DNS module with support for UDP, TCP, DoT, and DoH protocols

This commit introduces a custom DNS module for ESP32, enabling DNS resolution capabilities
over various protocols including UDP, TCP, DNS over TLS (DoT), and DNS over HTTPS (DoH).
The module includes initialization and cleanup functionalities, along with
protocol-specific implementations for each DNS type.

.github/workflows/esp_dns__build.yml

@@ -0,0 +1,38 @@
+name: "esp_dns: build-tests"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened, labeled]
+
+jobs:
+  build_esp_dns:
+    if: contains(github.event.pull_request.labels.*.name, 'dns') || github.event_name == 'push'
+    name: Build
+    strategy:
+      matrix:
+        idf_ver: ["latest", "release-v5.1", "release-v5.2", "release-v5.3", "release-v5.4"]
+        idf_target: ["esp32"]
+        test: [ { app: esp_dns_basic, path: "components/esp_dns/examples"}]
+        include:
+          - idf_ver: "latest"
+            warning: "the choice symbol ETHERNET_PHY_LAN867X\nis deprecated: Please use smi_gpio instead"
+
+    runs-on: ubuntu-22.04
+    container: espressif/idf:${{ matrix.idf_ver }}
+    steps:
+      - name: Checkout esp-protocols
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - name: Build ${{ matrix.test.app }} with IDF-${{ matrix.idf_ver }} for ${{ matrix.idf_target }}
+        env:
+          EXPECTED_WARNING: ${{ matrix.warning }}
+        shell: bash
+        working-directory: ${{matrix.test.path}}
+        run: |
+          . ${IDF_PATH}/export.sh
+          pip install idf-component-manager idf-build-apps --upgrade
+          python ../../../ci/build_apps.py ./${{ matrix.test.app }} --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app

.github/workflows/publish-docs-component.yml

@@ -103,5 +103,6 @@ jobs:
             components/mosquitto;
             components/sock_utils;
             components/libwebsockets;
+            components/esp_dns;
           namespace: "espressif"
           api_token: ${{ secrets.IDF_COMPONENT_API_TOKEN }}