Removed deserialization of byte array to Transaction in TransactionRepository.ContainsTransaction

[justingaffney]

Issue #389

• Removed deserialization of byte array to Transaction if a transaction exists in TransactionRepository.ContainsTransaction
• Added Contains methods to Redis DB context classes to check if the specified key exists

[shargon]

if you can fix the unit tests, i will aprove it

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (development@7293d33). Click here to learn what that means. The diff coverage is 26.92%.

@@              Coverage Diff               @@
##             development     #571   +/-   ##
==============================================
  Coverage               ?   52.23%           
==============================================
  Files                  ?      357           
  Lines                  ?    16225           
  Branches               ?        0           
==============================================
  Hits                   ?     8475           
  Misses                 ?     7750           
  Partials               ?        0

Impacted Files	Coverage Δ
...Sharp.Persistence.RedisDB/RedisDbJsonRepository.cs	63.31% <0%> (ø)
...NeoSharp.Persistence.RedisDB/RedisDbJsonContext.cs	0% <0%> (ø)
...chain/Processing/InvocationTransactionPersister.cs	0% <0%> (ø)
src/NeoSharp.Persistence.RedisDB/RedisDbContext.cs	0% <0%> (ø)
...arp.Persistence.RedisDB/RedisDbBinaryRepository.cs	77.97% <0%> (ø)
...e/Blockchain/Repositories/TransactionRepository.cs	24.17% <0%> (ø)
.../NeoSharp.Persistence.RocksDB/RocksDbRepository.cs	78.88% <0%> (ø)
...c/NeoSharp.BinarySerialization/BinarySerializer.cs	97.08% <100%> (ø)
src/NeoSharp.Core/Models/Transaction.cs	100% <100%> (ø)
src/NeoSharp.Core/VM/StateReader.cs	29.25% <83.33%> (ø)

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[justingaffney]

I have made the requested changes to fix the unit test, could you please review it again?