Add expired transactions to the mempool rejected list

[conradoplg]

Motivation

When a mempool transaction expires, we remove it from the mempool. But we should also add it to the rejected list, to avoid redownloading and reverifying it if it's sent again.

Specifications

Designs

At first the tx would fit into the chain_rejected_same_effects list which is used by txs rejected by excess capacity. But we should create a separate list for expired transactions. See discussion

Related Work