[roll] Roll fuchsia Add Rust support for KSpinlock and KEvent

Introduce KSpinlock and KEvent to the ksync library to support spinlock
and event synchronization in Rust kernel code.

- Implement KSpinlock by wrapping RawSpinlock, which interfaces with
  Zircon's C++ SpinLock.
- Implement KEvent by wrapping RawEvent, which interfaces with Zircon's
  C++ Event.
- Add newtype InterruptSavedState to hide architecture-specific interrupt
  state details.
- Add compile-time asserts in bindings.cc to verify layout compatibility
  for event and spinlock types between Rust and C++.
- Add helper macros in zr for less verbose FFI initialization and destruction.

Original-Original-Bug: 525049510
Test: ksync-tests, fx build
Original-Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1662939
Original-Original-Revision: 34c2f8feb62b60c53ce88f6c0f6146cd340faa80
GitOrigin-RevId: f7f6763c1c129ec3a2e17408628f15e7e550db80
Change-Id: Iea5157cd9f9c0d7f4a71044d66b2af7c809937a8
Reviewed-on: https://fuchsia-review.googlesource.com/c/integration/+/1665215
Cr-Commit-Position: refs/heads/main@{#195156}