[Feature Request] ReadOnlySpan based overload for JsonWebTokenHandler.CanReadToken

[henrikwidlund]

Is your feature request related to a problem? Please describe.
Not related to a problem, new feature to minimize allocations.

Describe the solution you'd like
A new overload for the CanReadToken method that accepts ReadOnlySpan<char> similar to

azure-activedirectory-identitymodel-extensions-for-dotnet/src/Microsoft.IdentityModel.JsonWebTokens/JsonWebToken.cs

Line 129 in bc00133

public JsonWebToken(ReadOnlyMemory<char> encodedTokenMemory)

Describe alternatives you've considered
None

Additional context
None