feat: JWT cache implementation based on sieve algorithm (#4084)

Changes:

1. Refactoring and some cleanup of JWT handling code:
* Instead of caching AuthResult cache decoded claims (which signature was verified). Validating claims and determining role is done after cache lookup
* Cleaned up API so that usage of it is simplified: lookupJwtCache cache key >>= parseClaims configJwtAud time
* Handling of JwtCacheState initialization and updates of configuration is encapsulated in Auth.JwtCache module

2. Generic high performance (hopefully) scalable, dynamically resizeable cache implementation based on stm, stm-hamt and sieve algorithm. It also integrates with PostgREST measurements infrastructure providing usage stats (ie. hit ratio, evictions count)

src/PostgREST/CLI.hs

@@ -203,8 +203,8 @@ exampleConfigFile =
       |# jwt-secret = "secret_with_at_least_32_characters"
       |jwt-secret-is-base64 = false
       |
-      |## Enables and set JWT Cache max lifetime, disables caching with 0
-      |# jwt-cache-max-lifetime = 0
+      |## Enables JWT Cache and sets its max size, disables caching with 0
+      |# jwt-cache-max-entries = 0
       |
       |## Logging level, the admitted values are: crit, error, warn, info and debug.
       |log-level = "error"