Enable metals inlay hints (helix-editor#10597)

languages.toml

@@ -53,7 +53,7 @@ ltex-ls = { command = "ltex-ls" }
 markdoc-ls = { command = "markdoc-ls", args = ["--stdio"] }
 markdown-oxide = { command = "markdown-oxide" }
 marksman = { command = "marksman", args = ["server"] }
-metals = { command = "metals", config = { "isHttpEnabled" = true } }
+metals = { command = "metals", config = { "isHttpEnabled" = true, metals = { inlayHints = { typeParameters = {enable = true} , hintsInPatternMatch = {enable = true} } } } }
 mint = { command = "mint", args = ["ls"] }
 nil = { command = "nil" }
 nimlangserver = { command = "nimlangserver" }