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1cf0601ba3
This patch extracts fields from `RoomEventCacheState` and move them into `RoomEventCacheStateLock`. This lock provides 2 methods: `read` and `write`, respectively to acquire a read-only lock, and a write-only lock, represented by the `RoomEventCacheStateLockReadGuard` and the `RoomEventCacheStateLockWriteGuard` types. All “public” methods on `RoomEventCacheState` now are facade to the read and write guards. This refactoring makes the code to compile with the last change in `EventCacheStore::lock`, which now returns a `EventCacheStoreLockState`. The next step is to re-load `RoomEventCacheStateLock` when the lock is dirty! But before doing that, we need this new mechanism to centralise the management of the store lock.