IOS XE-oriented dialect profile for netform_ir.

This crate provides a conservative IOS XE profile that customizes:

• comment classification (!, #)
• tokenization with quoted-string preservation

Example

use netform_dialect_iosxe::parse_iosxe;

let cfg = "interface Ethernet1\n  description \"WAN uplink\"\n";
let doc = parse_iosxe(cfg);
assert_eq!(doc.render(), cfg);