High-performance connection pool for PostgreSQL

 pgagroal is a high-performance protocol-native connection pool for PostgreSQL.
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 Pronounced: p-g-a-gro-al, named after Agroal in Portugal.
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 Features:
  * High performance
  * Connection pool
  * Limit connections for users and databases
  * Prefill support
  * Remove idle connections
  * Perform connection validation
  * Enable / disable database access
  * Graceful / fast shutdown
  * Prometheus support
  * Grafana 8 dashboard
  * Remote management
  * Authentication query support
  * Failover support
  * Transport Layer Security (TLS) v1.2+ support
  * Daemon mode
  * User vault