Improve Cypher language support in Code Editor

[nielsdejong]

We should update the integrated Cypher Editor to use the latest version of Neo4j Cypher Language Support: https://github.com/neo4j/cypher-language-support?tab=readme-ov-file

this gives us access to a lot of new features and makes it a lot easier for users to write Cypher in NeoDash:

• Support for plugging in a schema, so that label names, rel types and properties are autocompleted.
• Autocompletion of Cypher keywords (e.g. MATCH, WHERE, RETURN)
• Live syntax validation and formatting.

Demo of what is possible: https://neo4j.github.io/cypher-language-support/