Merge branch '274-deps-embedded_template_library-add-embedded_template_library-module' into 'main'

deps/embedded_template_library: Add embedded_template_library module

Closes #274

See merge request !485

data/modules/deps/embedded_template_library.json

+{
+  "general": {
+    "url": "https://github.com/ETLCPP/etl",
+    "authors": "Christoph Pohl <pohl@kit.edu>"
+  },
+
+  "update": {
+    "git": {
+      "github_slug": "ETLCPP/etl"
+    }
+  },
+
+  "prepare": {
+    "cmake": {
+      "# project_name": "etl",
+      "definitions": {
+        "CMAKE_INSTALL_PREFIX": "install",
+        "CMAKE_C_COMPILER": "$ARMARX_C_COMPILER",
+        "CMAKE_CXX_COMPILER": "$ARMARX_CXX_COMPILER"
+      }
+    }
+  },
+
+  "build": "cmake",
+
+  "install": {
+    "cmake": {},
+    "env": {
+      "etl_DIR": "$MODULE_PATH/build/install/share/etl/cmake"
+    }
+  },
+
+  "required_modules": {
+    "tools/cmake/3.21": {},
+    "armarx/meta/compiler": {}
+  }
+}