Create parse micro-bench for JsonNode and fix other JsonNode bench namespace

[andre-ss6]

Hey, I wanted to compare the current performance difference between JsonNode and JsonDocument for parsing-only. The docs say JsonDocument should be faster, but there doesn't seem to be much, if any at all, data on the subject out there. Given that the JsonNode API is friendlier and easier to work with overall, I wanted to see if the perf difference really justifies the hassle of using JsonDocument.

I came to the benchmarks here, but noticed there isn't one for just parsing with JsonNode. So I just duplicated the DocumentParse benchmark and changed it to test JsonNode instead.

Interestingly, after doing this I noticed some wonky results from JsonDocument on the 400KB payload benchmark, at : it was consistently slower than JsonNode, independently of whether I was testing random access, and when testing random access specifically the StdDev was through the roof, an order of magnitude higher than with JsonNode.

// * Summary *

BenchmarkDotNet v0.13.13-nightly.20240311.145, Windows 11 (10.0.22631.3958/23H2/2023Update/SunValley3)
AMD Ryzen 7 5800X3D, 1 CPU, 16 logical and 8 physical cores
.NET SDK 9.0.100-preview.6.24328.19
  [Host]     : .NET 9.0.0 (9.0.24.32707), X64 RyuJIT AVX2
  Job-GKTPJR : .NET 9.0.0 (9.0.24.32707), X64 RyuJIT AVX2

OutlierMode=DontRemove  PowerPlanMode=00000000-0000-0000-0000-000000000000  IterationTime=250ms
MaxIterationCount=20  MemoryRandomization=True  MinIterationCount=15
WarmupCount=1

JsonNode

Method	IsDataIndented	TestRandomAccess	TestCase	Mean	Error	StdDev	Median	Min	Max	Gen0	Gen1	Gen2	Allocated
Parse	False	False	HelloWorld	97.02 ns	2.140 ns	2.465 ns	96.25 ns	94.04 ns	103.0 ns	0.0050	-	-	264 B
Parse	False	False	BasicJson	359.44 ns	7.137 ns	6.676 ns	358.41 ns	350.69 ns	371.4 ns	0.0114	-	-	608 B
Parse	False	False	Json400B	522.44 ns	10.426 ns	11.589 ns	516.76 ns	510.13 ns	550.1 ns	0.0165	-	-	864 B
Parse	False	False	Json400KB	365,844.98 ns	2,866.525 ns	2,681.349 ns	365,716.62 ns	363,048.53 ns	373,740.9 ns	164.7059	164.7059	164.7059	587946 B
Parse	False	True	HelloWorld	244.77 ns	5.033 ns	5.796 ns	244.35 ns	236.35 ns	254.0 ns	0.0125	-	-	640 B
Parse	False	True	BasicJson	1,235.86 ns	24.582 ns	28.309 ns	1,227.97 ns	1,199.52 ns	1,327.0 ns	0.0490	-	-	2592 B
Parse	False	True	Json400B	1,860.95 ns	22.247 ns	20.810 ns	1,859.07 ns	1,835.23 ns	1,900.3 ns	0.0737	-	-	3744 B
Parse	False	True	Json400KB	2,537,976.18 ns	19,155.600 ns	17,918.160 ns	2,539,268.75 ns	2,502,348.96 ns	2,563,884.4 ns	208.3333	197.9167	156.2500	3203769 B
Parse	True	False	HelloWorld	100.98 ns	1.587 ns	1.484 ns	100.43 ns	99.22 ns	103.8 ns	0.0049	-	-	264 B
Parse	True	False	BasicJson	467.57 ns	7.670 ns	7.174 ns	465.56 ns	459.64 ns	483.1 ns	0.0130	-	-	696 B
Parse	True	False	Json400B	698.48 ns	13.009 ns	12.168 ns	700.77 ns	678.41 ns	725.4 ns	0.0167	-	-	960 B
Parse	True	False	Json400KB	547,934.78 ns	4,853.342 ns	4,539.819 ns	549,302.85 ns	538,140.13 ns	554,127.9 ns	164.4737	164.4737	164.4737	692451 B
Parse	True	True	HelloWorld	248.84 ns	4.311 ns	4.032 ns	248.87 ns	243.32 ns	258.2 ns	0.0118	-	-	640 B
Parse	True	True	BasicJson	1,378.24 ns	20.488 ns	19.164 ns	1,374.21 ns	1,356.89 ns	1,413.0 ns	0.0492	-	-	2680 B
Parse	True	True	Json400B	1,965.36 ns	36.440 ns	35.789 ns	1,955.43 ns	1,932.88 ns	2,065.1 ns	0.0707	-	-	3840 B
Parse	True	True	Json400KB	3,037,103.64 ns	16,059.519 ns	15,022.084 ns	3,039,665.12 ns	3,001,490.70 ns	3,058,404.7 ns	232.5581	209.3023	186.0465	3306994 B

JsonDocument

Method	IsDataIndented	TestRandomAccess	TestCase	Mean	Error	StdDev	Median	Min	Max	Gen0	Allocated
Parse	False	False	HelloWorld	85.81 ns	1.362 ns	1.274 ns	85.73 ns	83.39 ns	88.04 ns	0.0014	72 B
Parse	False	False	BasicJson	336.00 ns	2.942 ns	2.752 ns	335.35 ns	332.69 ns	343.99 ns	0.0013	72 B
Parse	False	False	Json400B	474.93 ns	6.101 ns	5.707 ns	473.52 ns	467.97 ns	488.17 ns	-	72 B
Parse	False	False	Json400KB	317,439.44 ns	4,305.240 ns	4,027.124 ns	315,846.98 ns	313,530.15 ns	328,462.69 ns	-	72 B
Parse	False	True	HelloWorld	127.96 ns	1.601 ns	1.497 ns	128.55 ns	125.86 ns	130.41 ns	0.0021	120 B
Parse	False	True	BasicJson	749.59 ns	7.256 ns	6.788 ns	747.77 ns	742.22 ns	761.83 ns	0.0060	328 B
Parse	False	True	Json400B	1,353.59 ns	26.735 ns	28.606 ns	1,345.58 ns	1,324.24 ns	1,449.76 ns	0.0107	592 B
Parse	False	True	Json400KB	4,505,171.25 ns	1,167,072.166 ns	1,344,002.042 ns	3,598,700.00 ns	3,402,300.00 ns	6,700,600.00 ns	-	611848 B
Parse	True	False	HelloWorld	93.36 ns	1.876 ns	1.755 ns	93.38 ns	89.55 ns	97.05 ns	0.0011	72 B
Parse	True	False	BasicJson	431.18 ns	8.182 ns	8.036 ns	428.31 ns	423.01 ns	452.02 ns	-	72 B
Parse	True	False	Json400B	632.65 ns	10.544 ns	9.862 ns	628.20 ns	623.12 ns	655.57 ns	-	72 B
Parse	True	False	Json400KB	483,170.78 ns	4,728.549 ns	4,423.087 ns	481,765.38 ns	477,670.38 ns	493,015.96 ns	-	72 B
Parse	True	True	HelloWorld	146.76 ns	2.846 ns	2.923 ns	145.43 ns	142.70 ns	155.69 ns	0.0023	120 B
Parse	True	True	BasicJson	875.30 ns	14.357 ns	13.430 ns	872.13 ns	861.78 ns	918.00 ns	0.0035	328 B
Parse	True	True	Json400B	1,542.27 ns	18.541 ns	17.343 ns	1,538.34 ns	1,521.32 ns	1,590.34 ns	0.0062	592 B
Parse	True	True	Json400KB	5,580,596.25 ns	2,032,080.702 ns	2,340,147.159 ns	3,886,662.50 ns	3,644,600.00 ns	8,899,975.00 ns	-	611848 B