Add benchmarks and optimize Hashing util

[gmanvel]

Description

Added benchmarks to cover some parts of the system. The intention is to have perf benchmarks & test coverage so that code optimizations can be properly applied and regressions (if any) captured.

Related Issues

N/A

Proposed Changes

• Adding Benchmarks project and BenchmarkDotNet benchmarks to cover some parts
• Unit tests to cover Hashing functionality
• Optimized implementation of GenerateSha512Hash method

Tested to ensure optimized version generates same hash as existing one. Ran current/optimized version side by side. Pasting BenchmarkDotNet results below

Method	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Allocated	Alloc Ratio
HashSmallProperties	360.3 ns	2.49 ns	2.33 ns	1.00	0.01	0.1011	-	848 B	1.00
HashSmallPropertiesOptimized	256.4 ns	2.71 ns	2.40 ns	0.71	0.01	0.0525	-	440 B	0.52
HashMediumProperties	340.3 ns	1.46 ns	1.22 ns	0.94	0.01	0.1817	-	1520 B	1.79
HashMediumPropertiesOptimized	495.0 ns	3.95 ns	3.70 ns	1.37	0.01	0.0525	-	440 B	0.52
HashLargeProperties	1,099.8 ns	7.26 ns	6.79 ns	3.05	0.03	0.6943	0.0038	5816 B	6.86
HashLargePropertiesOptimized	1,898.8 ns	7.06 ns	6.61 ns	5.27	0.04	0.0515	-	440 B	0.52
HashLargeValueProperties	4,126.8 ns	48.73 ns	45.58 ns	11.45	0.14	3.9063	0.1907	32752 B	38.62
HashLargeValuePropertiesOptimized	3,487.1 ns	29.87 ns	27.94 ns	9.68	0.10	0.0496	-	440 B	0.52
HashWithTuples	358.9 ns	2.15 ns	2.01 ns	1.00	0.01	0.2027	-	1696 B	2.00

As can be seen memory allocations are capped at 440 B regardless of the fields' payload. However, this comes with a trade off of perf regression for medium & large properties. For small & large values performance actually improves. However, suggested changes are mainly to improve allocations.

Scenario	Original Alloc	Optimized Alloc	Absolute Savings	% Reduction
Small	848 B	440 B	408 B	51.9%
Medium	1,520 B	440 B	1,080 B	71.1%
Large	5,816 B	440 B	5,376 B	92.4%
LargeVal	32,752 B	440 B	32,312 B	98.7%

Checklist

• I have tested these changes locally.
• I have reviewed the code changes.
• I have updated the documentation (if necessary).
• I have added appropriate unit tests (if applicable).

Additional Notes

N/A

[KSemenenko]

Thanks a lot! This is just an amazing PR!

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