Update .gitignore, add dist directory

dist/lib/schema/is-vector-field.d.ts

@@ -0,0 +1,5 @@
+import type { BUN_MARIADB_FieldSchemaType } from "../../types";
+/**
+ * True when a field is a MariaDB native vector column.
+ */
+export default function isVectorField(field?: BUN_MARIADB_FieldSchemaType): boolean;