Fix flush with generic allocator so that we do not write invalid data…

… to disk in rare cases (record was invalid when making initial image, but (microsoft#916)

Fix ContinuePendingRead to account for new records for the same key t…

…hat were added and then went to dusk during the pending Read operation. (microsoft#911)

Use Azure-Functions-compatible Microsoft.Extensions.Logging (microsof…

…t#897)

* modify version of Microsoft.Extensions.Logging to be 6.0.0 when building net6.0 target

* update FASTER.core.nuspec also

allow reading v4 checkpoints with current version (microsoft#896)

Fix incorrect clearing of pool in BufferPool.cs

[C#] Replace LockingMode with ConcurrencyControlMode (microsoft#867)

* Replace LockingMode with ConcurrencyControlMode

* Fix 'Remote' solution build

- Set both Sealed and Invalid on new records to ensure consistency bo…

…th during normal operations and after recovery, which clears the Sealed bit. (microsoft#864)

- Seal ConcurrentUpdater and InPlaceUpdater source records on successful RCU even when not doing Standard locking

Store delta log tail address (microsoft#861)

* Store delta log tail address

* fix + comment

Fix edge case for incremental snapshot (microsoft#858)

[C#] Fix missing Sunlock on nested CopyToTail lock (microsoft#857)

* Fix missing Sunlock on nested CopyToTail lock

* Improve handling of Sealed records in Ephemeral locking

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Co-authored-by: Badrish Chandramouli <badrishc@microsoft.com>