* replace lock/semaphore by readerwriterlockslim to avoid lock contention while dispatch messages

* Update MqttClientSubscriptionsManager.cs

removed comment out codes

* Update ReleaseNotes.md

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Co-authored-by: NZeheng Feng <hf944813@broadcom.com>
Co-authored-by: NChristian <6939810+chkr1011@users.noreply.github.com>

* Add new overload for options builder

* Refactor code

* Update ReleaseNotes.md

* Notify what subscription topics failed as part of the SynchronizingSubscriptionsFailedAsync callback

* Update ReleaseNotes.md

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Co-authored-by: NChristian <6939810+chkr1011@users.noreply.github.com>

* ClientMessageQueueInterceptor continues with subscription processing.

* Update readme

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Co-authored-by: NChristian <6939810+chkr1011@users.noreply.github.com>

* Add compatibility option for AWS

* Fix UWP build

* Fix comment in MqttClientOptions (#1706)

* Refactor naming

* Fix wrong option value

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Co-authored-by: NMichi <michael@volz.dev>

Add user properties to event args

Fix running state handling

* Expose server session items

* Add support for custom session items for injected application messages

* Expose TCP keep alive options to options builder

* Update ReleaseNotes.md

* Expose more options in disconnect options.

* Expose more options in disconnect API.

* Refactor code.

* Expose user properties in disconnected event.

* Expose more disconnect options in server.

* Fix build errors

* Add new samples.

* Fix client cleanup

* Fix merge conflicts

* Add feature validation.

* Update ReleaseNotes.md

* Add validators or subscribe and unsubscribe.

* Add feature validation for disconnect.

* Fix build errors.

* Fix build errors
Co-authored-by: NHansM <HansM2013@gmx.de>

1546 possible bug in server repeatedly sending the same message to client subscribed with cleansession=false (#1569)