brian/gauged tokio channel

[bchocho]

• mempool debug
• fix timers
• sort each batch in progress
• remove hashmap and just binary search
• sort inside of batch generator
• classify a long pull as a non-empty pull
• sort in spawn_blocking
• clean up counters
• refactor into update_...
• sample only every minute
• remove biased
• create a gauged tokio channel, use it for batch generator-related channels

Description

Test Plan

[github-actions[bot]]

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