Identityserver4: Year 2038 problem in nbf and exp

[vanbukin]

Issue / Steps to reproduce the problem

If we look into that lines https://github.com/IdentityServer/IdentityServer4/blob/nuget_2.3.0-preview2/src/Validation/Default/TokenValidator.cs#L452-L453 we will see, that reference token nbf and exp claims values comes from calling .ToEpochTime extension method from IdentityModel https://github.com/IdentityModel/IdentityModel2/blob/3.10.1/src/EpochTimeExtensions.cs#L16, which returns Int32, instead of Int64.
I think it should return Int64, or have additional extension method, that returns Int64.

[leastprivilege]

Will switch to the .NET built-in ones in v3

https://identitymodel.readthedocs.io/en/latest/misc/epoch_time.html

[brockallen]

Looks like a lot has been updated to use long, but where we emit claims we need to change to use ClaimValueTypes.Integer64.

[leastprivilege]

done on branch. Will be merged into 3.0

[lock[bot]]

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