refactor(core): split web entry from core (#6082)

This pr is trying to split `web` and `electron` entries from `core`. It allows more platform-related optimization to be addressed in each entry.
We should remove all browser/electron only codes from `core` eventually, this is the very first step for that.

.github/actions/download-web/action.yml

@@ -0,0 +1,22 @@
+name: 'Download core artifacts'
+description: 'Download core artifacts and extract to dist'
+inputs:
+  path:
+    description: 'Path to extract'
+    required: true
+
+runs:
+  using: 'composite'
+  steps:
+    - name: Download tar.gz
+      uses: actions/download-artifact@v4
+      with:
+        name: web
+        path: .
+
+    - name: Extract core artifacts
+      shell: bash
+      run: |
+        mkdir -p ${{ inputs.path }}
+        tar -xvf dist.tar.gz --directory ${{ inputs.path }}
+        rm dist.tar.gz