chore: run cpp tests on CI (#443)

# Summary

Creates CI workflow which verifies if cpp tests are passing. It runs
only when something changes inside `cpp` directory.

## Test Plan

See results of
https://github.com/software-mansion/react-native-enriched/actions/runs/22477961956

## Screenshots / Videos

n/a

## Compatibility

| OS      | Implemented |
| ------- | :---------: |
| iOS     |    ✅     |
| Android |    ✅     |

Author: exploIF

.github/workflows/test-cpp.yml

@@ -0,0 +1,32 @@
+name: Test C++
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - 'cpp/**'
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'cpp/**'
+  merge_group:
+    types:
+      - checks_requested
+
+jobs:
+  test-cpp:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Configure CMake
+        run: cmake -S cpp -B cpp/build -DCMAKE_BUILD_TYPE=Release
+
+      - name: Build
+        run: cmake --build cpp/build --parallel
+
+      - name: Run tests
+        run: ctest --test-dir cpp/build --output-on-failure