[shared storage] Add Web Locks to the worklet

Explainer: https://github.com/WICG/shared-storage/pull/199

Key points:
- `SharedStorageWorkletNavigator` is a new interface that only
  supports `locks`. Implementation-wise, we inherit NavigatorBase
  so it's compatible with the LockManager implementation. Some
  methods are obviously unreachable (e.g. GetAcceptLanguages()).
- Add the member `LockManager<OriginLockGroupId> lock_manager_;` to
  SharedStorageWorkletHostManager: The locks have a shared storage
  specific scope (separate from the Window/Worker locks), and are
  further partitioned by shared storage origin.

Bug: 373899210
Change-Id: I9908962949088356c2a61c1556183ccd5772985f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5937903
Reviewed-by: Ayu Ishii <ayui@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1370865}