Adding an action-script for an automated update of yarn.lock (#206)

### What's done:
- to control JS depency versions there a special file, called yarn.lock, that check check-sum of the dependencies. Each time the dependency is updated, same should be done with this file.

.github/workflows/kjs-yarn-update.yml

@@ -0,0 +1,51 @@
+name: Update yarn.lock generated by Kotlin Gradle Plugin
+
+on:
+  pull_request:
+    paths:
+      - 'gradle/libs.versions.toml'
+      - 'ktoml-core/build.gradle.kts'
+  push:
+    paths:
+      - 'gradle/libs.versions.toml'
+      - 'ktoml-core/build.gradle.kts'
+
+jobs:
+  update_kjs_yarn_lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        if: github.event_name == 'pull_request'
+        with:
+          # Checkout source branch directly, without merging base into it
+          ref: ${{ github.event.pull_request.head.ref }}
+      - uses: actions/checkout@v3
+        if: github.event_name == 'push'
+        with:
+          # Checkout source branch directly, without merging base into it
+          ref: ${{ github.event.push.ref }}
+      - name: Generate yarn.lock
+        uses: gradle/gradle-build-action@v2
+        with:
+          gradle-version: wrapper
+          arguments: |
+            kotlinStoreYarnLock
+            --build-cache
+            -PgprUser=${{ github.actor }}
+            -PgprKey=${{ secrets.GITHUB_TOKEN }}
+      - name: Dedupe generated yarn.lock
+        run: |
+          npm install -g yarn-deduplicate
+          yarn-deduplicate
+      - name: Commit and push if yarn.lock is changed
+        run: |
+          git add yarn.lock
+          if git diff --staged --quiet; then
+            echo Everything is UP-TO-DATE
+          else
+            echo Pushing updated yarn.lock
+            git config user.name akuleshov7
+            git config user.email 'andrewkuleshov7@gmail.com'
+            git commit -m "Update yarn.lock"
+            git push
+          fi