Add .cypher icon, file template and type

[jamthief]

Supports:

• Creating a new Cypher file via the New > Cypher File menu
• File type association as a Cypher File to prevent IntelliJ not "recognising" it
• Custom file icon in open files tab

[ncordon]

Maybe it'd be better if we had neo4j's official logo as file icon? Do we need the Cypher File.cypher.ft file in this pr?

[jamthief]

Maybe it'd be better if we had neo4j's official logo as file icon?

So I got this logo from the brand pack, it is designated for "Cypher", hence why I chose it! If you think it's better as the neo4j logo then I can change it, but I figured if we ever release this officially we'd probably get design to review it first.

Do we need the Cypher File.cypher.ft file in this pr?

Yeah, this provides a template for whatever content you want to appear when selecting "New > Cypher File" from the file menu.

[jamthief]

Or if not the Cypher logo, we could use the brand shapes (node shapes on a hexagon grid): https://www.neo4j.design/40a8cff71/p/995201-brand-shapes

e.g.