Replace JsonWebToken ReadPayloadValue with a delegate

[pmaytak]

#2982

[pmaytak]

Looks like when using delegates there're extra allocations because of:

string claimName = reader.GetString();
claims[claimName] = ReadTokenPayloadValueDelegate(ref reader, claimName);

Delegates	Method	Mean	Ratio	Error	StdDev	P90	P95	P100	Gen0	Allocated	Alloc Ratio
Without	JsonWebTokenHandler_ValidateTokenAsyncWithTVP	30.72 μs	1.000	0.026 μs	0.055 μs	30.79 μs	30.81 μs	30.89 μs	0.2441	7.23 KB	1.00
With	JsonWebTokenHandler_ValidateTokenAsyncWithTVP	30.66 μs	0.998	0.124 μs	0.273 μs	30.96 μs	31.02 μs	31.10 μs	0.3052	7.55 KB	1.044

Delegates	Method	Mean	Ratio	Error	StdDev	P90	P95	P100	Gen0	Allocated	Alloc Ratio
Without	ReadJWS_FromMemory	8.373 μs	1.00	0.0331 μs	0.0727 μs	8.465 μs	8.499 μs	8.530 μs	0.2289	5.84 KB	1.00
With	ReadJWS_FromMemory	8.201 μs	0.979	0.0287 μs	0.0636 μs	8.295 μs	8.313 μs	8.357 μs	0.2441	6.07 KB	1.039

Copilot reviewed 5 out of 9 changed files in this pull request and generated no comments.

Files not reviewed (4)

• src/Microsoft.IdentityModel.JsonWebTokens/InternalAPI.Unshipped.txt: Language not supported
• src/Microsoft.IdentityModel.Tokens/InternalAPI.Unshipped.txt: Language not supported
• test/Microsoft.IdentityModel.JsonWebTokens.Tests/CustomJsonWebToken.cs: Evaluated as low risk
• src/Microsoft.IdentityModel.JsonWebTokens/Json/JsonWebToken.PayloadClaimSet.cs: Evaluated as low risk

Comments suppressed due to low confidence (1)

src/Microsoft.IdentityModel.JsonWebTokens/Json/JsonClaimSet.cs:31

• The initialization of _jsonClaims should be 'new Dictionary<string, object>()' instead of '[]'.

_jsonClaims = [];

[pmaytak]

Updated results comparing delegates which have a dictionary as a parameter. Ran JsonWebTokenHandler_ValidateTokenAsyncWithTVP and ReadJWS_FromMemory with extended claims. These test using the default delegate implemenation.

Delegates	Method	Mean	Ratio	Error	StdDev	P90	P95	P100	Gen0	Allocated	Alloc Ratio
Without	JsonWebTokenHandler_ValidateTokenAsyncWithTVP	30.13 μs	1.00	0.169 μs	0.374 μs	30.61 μs	30.74 μs	31.07 μs	0.2441	7.23 KB	1.00
With	JsonWebTokenHandler_ValidateTokenAsyncWithTVP	29.34 μs	0.974	0.085 μs	0.188 μs	29.59 μs	29.61 μs	29.87 μs	0.2441	7.33 KB	1.014

Delegates	Method	Mean	Ratio	Error	StdDev	P90	P95	P100	Gen0	Allocated	Alloc Ratio
Without	ReadJWS_FromMemory	7.523 μs	1.00	0.0333 μs	0.0724 μs	7.599 μs	7.612 μs	7.672 μs	0.2365	5.84 KB	1.00
With	ReadJWS_FromMemory	7.059 μs	0.938	0.0416 μs	0.0905 μs	7.160 μs	7.170 μs	7.205 μs	0.2365	5.84 KB	1.00

BenchmarkDotNet v0.13.12, Windows 11 (10.0.26100.2605) (Hyper-V)
Intel Xeon Platinum 8370C CPU 2.80GHz, 1 CPU, 16 logical and 8 physical cores
.NET SDK 9.0.101
[Host] : .NET 8.0.11 (8.0.1124.51707), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI
MediumRun : .NET 8.0.11 (8.0.1124.51707), X64 RyuJIT AVX-512F+CD+BW+DQ+VL+VBMI