[NS-54][transfer] `TransferDescriptor` cleanups and improvements

[q10]

Summary:

• Rewrite TransferDescriptor to be more testable and include more detailed documentation
• Add hex dump printing to TransferDescriptor to help with debugging
• Move nullable_t_struct enum values over to VeType as part of the interface
• Add more strict unit tests for TransferDescriptor than previously defined
• Add extension methods for JavaCPP Pointer classes to convert to corresponding Array[T] types, extract slices of BytePointer, and return hex dump of BytePointer
• Update FixedBitSet to correctly produce a validity buffer with exactly N 1-bits
• Replace use of the existing TransferDescriptor with that of the cleaned TransferDescriptor
• Add unit tests for JavaCPP Pointer extension methods

[sonarcloud[bot]]

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0 Security Hotspots
4 Code Smells

0.0% Coverage
1.0% Duplication