Send mined transaction IDs to mempool storage for removal

[teor2345]

Motivation

Zebra needs to remove mined transaction IDs from the mempool, whenever the state tip Grows.

Design

Tasks can await tip changes using ChainTipChange::tip_change and TipAction::Grow:

zebra/zebra-state/src/service/chain_tip.rs

Line 313 in 44ac067

pub async fn tip_change(&mut self) -> Result<TipAction, watch::error::RecvError> {

We currently don't have a method on mempool::Storage to remove members of the mempool for whatever reason, so that will have to be done to support this.

[mpguerra]

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[dconnolly]

Does this conflict with #2682 ?
Let's close this one in favor of that one

[teor2345]

I think the conflict is with #2631 - if we do #2631, this ticket is redundant.
(And #2631 is better, and more similar to existing code like #2682.)

[teor2345]

We removed #2631 from the sprint, so we need to add this ticket back in.