A field day for Gleam's language server – Gleam v1.18.0 release

Gleam v1.18.0 introduces significant language server improvements, including full support for record field operations (go-to-definition, find-references, and rename), type variable renaming, module renaming with automatic import updates, and an enhanced pattern-match code action for function calls. The release also optimizes JavaScript output for data singletons, improving performance when targeting JavaScript runtimes.