feature: Implement Authentication & Authorization For The Caching Server

[stevekuznetsov]

Feature Description

Reading directly from the caching server should be a highly privileged (system:masters) task. Writing to it should only be possible by a shard, and shards can only write to their own subset of the cache space.

Proposed Solution

To be designed. Access for controllers and others using ThingReplicationClaim is not in scope.

Alternative Solutions

No response

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Additional Context

No response