feat: initial ABsmartly C++ SDK implementation

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build-and-test:
+    name: Build & test
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y cmake g++ libcurl4-openssl-dev
+
+      - name: Configure
+        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DABSMARTLY_BUILD_TESTS=ON
+
+      - name: Build
+        run: cmake --build build --parallel
+
+      - name: Test
+        run: ctest --test-dir build --output-on-failure

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(absmartly-sdk VERSION 1.0.0 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include(FetchContent)
+
+FetchContent_Declare(
+  json
+  URL https://github.com/nlohmann/json/releases/download/v3.11.3/json.tar.xz
+)
+FetchContent_MakeAvailable(json)
+
+add_library(absmartly-sdk
+  src/md5.cpp
+  src/murmur3.cpp
+  src/variant_assigner.cpp
+  src/utils.cpp
+  src/context.cpp
+  src/client.cpp
+  src/default_context_data_provider.cpp
+  src/default_context_publisher.cpp
+  src/sdk.cpp
+  src/json_expr/evaluator.cpp
+  src/json_expr/operators.cpp
+  src/audience_matcher.cpp
+)
+
+target_include_directories(absmartly-sdk PUBLIC
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+  $<INSTALL_INTERFACE:include>
+)
+
+target_link_libraries(absmartly-sdk PUBLIC nlohmann_json::nlohmann_json)
+
+find_package(CURL REQUIRED)
+target_sources(absmartly-sdk PRIVATE src/default_http_client.cpp src/async_http_client.cpp)
+target_link_libraries(absmartly-sdk PUBLIC CURL::libcurl)
+
+option(ABSMARTLY_BUILD_TESTS "Build tests" ON)
+if(ABSMARTLY_BUILD_TESTS)
+  enable_testing()
+  add_subdirectory(tests)
+endif()