Ship CSS Module Scripts

Enable CSS module scripts by default.

I2S blink-dev thread: https://groups.google.com/a/chromium.org/g/blink-dev/c/iT0bQjzD04k
HTML Spec PR: whatwg/html#4898

Bug: 992499
Change-Id: I618ec0579cfd4e652306d0da539335878adfa53d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2957354
Reviewed-by: Domenic Denicola <domenic@chromium.org>
Reviewed-by: Yoav Weiss <yoavweiss@chromium.org>
Commit-Queue: Dan Clark <daniec@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#902075}
NOKEYCHECK=True
GitOrigin-RevId: 39e0478a21b609d55a131427ce256061bf69a426

blink/renderer/platform/runtime_enabled_features.json5

@@ -645,7 +645,7 @@
     },
     {
       name: "CSSModules",
-      status: "experimental",
+      status: "stable",
     },
     {
       name: "CSSOffsetPathRay",