Rework license validator to not use ConcurrentDictionary

DuendeSoftware / IdentityServer

The most flexible and standards-compliant OpenID Connect and OAuth 2.x framework for ASP.NET Core

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Closed AndersAbel closed 6 months ago

AndersAbel commented 6 months ago

ConcurrentDictionary has excellent concurrency performance for reading/writing invidivual key/values. But the locking pattern for reading the count and getting all keys is quite bad.
Add tests
Fixes #1526