feat: Add simple script to sync fork with local branch (#4102)

#### Testing:

From the base folder of this repo, run:
```bash
./scripts/sync_fork.sh git@github.com:aseembits93/unstructured.git optimize-_assign_hash_ids-memtfran
```
Check to make sure the only remote is `origin` with:
```bash
git remote
```
Check the diff from `main` with:
```bash
git diff main
```

Author: qued

scripts/sync_fork.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+# Simple script to recreate a fork branch as a new branch in the current repository
+# Usage: ./sync_fork.sh <fork_url> <fork_branch>
+
+set -e
+
+if [ $# -ne 2 ]; then
+  echo "Usage: $0 <fork_url> <fork_branch>"
+  echo "Example: $0 https://github.com/user/fork.git feature-branch"
+  exit 1
+fi
+
+FORK_URL="$1"
+FORK_BRANCH="$2"
+
+echo "Adding fork as remote..."
+git remote add fork "$FORK_URL" 2>/dev/null || git remote set-url fork "$FORK_URL"
+
+echo "Fetching fork..."
+git fetch fork
+
+echo "Creating new branch '$FORK_BRANCH' with fork's changes..."
+git checkout -b "$FORK_BRANCH" "fork/$FORK_BRANCH"
+
+echo "Removing fork remote..."
+git remote remove fork
+
+echo "Done! You're now on branch '$FORK_BRANCH' with the fork's changes. Fork remote has been removed."