Fix #292: Add server-specific channel statistics #315
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This commit adds support for server-specific channel statistics to prevent information leakage between different server instances running on the same host.
The issue was that the published_messages and stored_messages counters were stored in a shared memory segment that is shared across all server instances running on the same host. When a user requests channel statistics from one server instance, they were seeing the combined statistics from all server instances, which could leak information.
Changes:
This fix ensures that each server instance only reports its own statistics, preventing information leakage between different server instances.
Addresses: #292
cc: @wandenberg