Update changelogs from fern repo (#4983)

Co-authored-by: dsinghvi <10870189+dsinghvi@users.noreply.github.com>

Author: fern-support

fern/products/sdks/generators/typescript/changelog/2026-04-17.mdx

@@ -0,0 +1,8 @@
+## 3.64.0
+**`(feat):`** Add queryBuilder() for query parameter serialization with per-parameter format control.
+The generator now emits a fluent builder pattern (`core.url.queryBuilder()`) for query string
+construction, where each parameter's serialization format is decided at code-gen time via
+`.add(key, value, { style: "comma" })`. OpenAPI query parameters with `explode: false` use
+the comma style to produce comma-separated values (e.g., `tags=a,b,c`).
+
+