feat(changelog): add changelog trickle down action

actions/trickle-down-changelog/README.md

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+# Trickle Down Changelog GH Action
+
+This action will open PRs in downstream release branches with changes from the changelog.
+For example:
+
+- If you update the current GA branch with changes, you will also need to update beta branch and main branches.
+- This action will open PRs in beta and main branches with the changes from the changelog.
+
+## Inputs
+
+### `token`
+
+**Required** The GitHub token to use for authentication.
+
+## Usage
+
+```yaml
+jobs:
+	trickle-down-changelog:
+		runs-on: ubuntu-latest
+		steps:
+			- name: Checkout code
+			  uses: actions/checkout@v2
+			- name: Run action
+			  uses: elementor/elementor-pro/.github/actions/trickle-down-changelog@main
+			  with:
+				  token: ${{ secrets.GITHUB_TOKEN }}
+```
+
+## Build
+
+This action uses `ncc` to build the modules inside the javascript file, so no need to install any dependencies, **make sure to build before merging**.
+
+run `npm run build` to build the action. The build artifacts will be stored in the `dist/` directory.

actions/trickle-down-changelog/action.yml

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+name: 'Trickle down changelog action'
+description: 'Create PRs for changelog changes'
+inputs:
+    token:
+        description: 'GitHub token'
+        required: true
+
+runs:
+    using: 'node20'
+    main: 'dist/index.js'