Commits on Oct 5, 2021

1. Fix long-standing bug where ReadWriteLock could drop logging contexts …

   Use `PreserveLoggingContext()` to ensure that logging contexts are not
   lost when exiting a read/write lock.
   
   When exiting a read/write lock, callbacks on a `Deferred` are triggered
   as a signal to any waiting coroutines. Any waiting coroutine that
   becomes runnable is likely to follow the Synapse logging context rules
   and will restore its own logging context, then either run to completion
   or await another `Deferred`, resetting the logging context in the
   process.

   Sean Quah committed Oct 5, 2021
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