Add RwLock to embassy-sync #3932
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Fixes embassy-rs#1394 --- For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/embassy-rs/embassy/issues/1394?shareId=XXXX-XXXX-XXXX-XXXX).
* Implement `RawRwLock` trait with methods for read and write locking * Implement `RawRwLockImpl` struct with atomic state and waker * Implement `RawRwLockImpl::lock_read`, `RawRwLockImpl::try_lock_read`, and `RawRwLockImpl::unlock_read` methods * Implement `RawRwLockImpl::lock_write`, `RawRwLockImpl::try_lock_write`, and `RawRwLockImpl::unlock_write` methods
…ions in ThreadModeRawRwLock
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Fixes #1394
The implementation is very similar to
Mutex