[rpc] Add Tracking to Subscriptions Made via HTTP for Unused Filter Eviction #18591
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Then adds a missing feature from Geth: evicting stale filters via a background "timeout" loop. Similar to what was done in okx#777 but hopefully more efficient.
Meant to help avoid accumulate more Go heap for unused filters which only further hurt performance over time.
Also adds metrics for keeping track of the number of filters we have so we can confirm they do not grow indefinitely.