[CURATOR-373] Add option to PersistentNode to not overwrite/delete existing node

Currently, when PersistentNode.start() is called, and a node at the specified path already exists, this existing node's data is overwritten with the PersistentNode's data.

Similarly, when PersistentNode.close() is called, the node is deleted, even if a node existed at the specified path before PersistentNode.start() was called.

Add an option to PersistentNode to not overwrite/delete an existing node.

---
Originally reported by lakospeter, imported from: Add option to PersistentNode to not overwrite/delete existing node

• status: Open
  
• priority: Major
  
• resolution: Unresolved
  
• imported: 2025-01-21