Add MapInboundClaims option

[luluvia]

I recently ran into an issue highlighted in this Stack Overflow post: https://stackoverflow.com/questions/57998262/why-is-claimtypes-nameidentifier-not-mapping-to-sub

It had to do with how .NET by default maps claims. I wanted to avoid this remapping behavior, but the option to turn this off does not exist within the Clerk.Net.AspNetCore.Security options. There is an alternative that works as a workaround right now in the linked Stack Overflow thread, but I would rather do this idiomatically if possible. Thanks!

[Hawxy]

Thanks for the suggestion, I'll consider adding this. You can use post-configuration as a workaround:
builder.Services.PostConfigure<JwtBearerOptions>(ClerkAuthenticationDefaults.AuthenticationScheme, x=> {...})