Add ProtocolReader Benchmarks

[alistairjevans]

In these changes I've:

• Added a Bedrock.Framework.Benchmarks console project
• Configured an artifacts path with timestamped folders.
• Added the MemoryDiagnoser.
• Defined a benchmark class, ProtocolReaderBenchmarks
• Added three benchmarks to that class:
  • PipeOnly - This is a baseline benchmark to determine the cost of only doing pipe write and read (without Bedrock).
  • ReadProtocolWithWholeMessageAvailable - A benchmark for when the entire message is available (so the ProtocolReader.ReadAsync can just return immediately).
  • ReadProtocolWithPartialMessageAvailable - A benchmark for when the entire message is not available, and the ReadAsync method must go round again.

The ProtocolReader benchmarks do the absolute bare minimum of message reading work with a local IMessageReader implementation that just moves the positions along and returns whether the whole expected size is available.

Fixes #23.

Local Results:

BenchmarkDotNet=v0.12.0, OS=Windows 10.0.18363
AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx, 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=3.1.100
  [Host]     : .NET Core 3.1.0 (CoreCLR 4.700.19.56402, CoreFX 4.700.19.56404), X64 RyuJIT
  DefaultJob : .NET Core 3.1.0 (CoreCLR 4.700.19.56402, CoreFX 4.700.19.56404), X64 RyuJIT

Method	MessageSize	Mean	Error	StdDev	Ratio	RatioSD	Gen 0	Gen 1	Gen 2	Allocated
PipeOnly	10	405.6 ns	4.05 ns	3.59 ns	1.00	0.00	-	-	-	-
ReadProtocolWithWholeMessageAvailable	10	476.9 ns	8.72 ns	8.15 ns	1.17	0.02	-	-	-	-
ReadProtocolWithPartialMessageAvailable	10	622.6 ns	9.74 ns	9.11 ns	1.54	0.03	-	-	-	-
PipeOnly	100	404.5 ns	4.29 ns	4.01 ns	1.00	0.00	-	-	-	-
ReadProtocolWithWholeMessageAvailable	100	486.5 ns	8.34 ns	7.80 ns	1.20	0.02	-	-	-	-
ReadProtocolWithPartialMessageAvailable	100	629.4 ns	9.36 ns	8.75 ns	1.56	0.03	-	-	-	-
PipeOnly	1000	438.1 ns	5.05 ns	4.72 ns	1.00	0.00	-	-	-	-
ReadProtocolWithWholeMessageAvailable	1000	582.3 ns	11.46 ns	16.44 ns	1.35	0.03	-	-	-	-
ReadProtocolWithPartialMessageAvailable	1000	734.9 ns	12.15 ns	10.77 ns	1.68	0.03	-	-	-	-

[davidfowl]

small nit: remove extra space

[alistairjevans]

Done; I've got so used to the analysers catching this for me.

[davidfowl]

Thanks!!