KIP-83 — Allow multiple SASL authenticated Java clients in a single JVM process

Discarded Security

KIP-83 proposes making `LoginManager` non-singleton so multiple Kafka clients within the same JVM can each hold separate SASL/GSSAPI login contexts keyed on their JAAS configuration object. The singleton design forces all clients in a JVM to share one set of credentials, preventing multi-cluster or multi-tenant producers/consumers from authenticating to different Kafka clusters with distinct identities.

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