refactor(model, cache): a full message object for `MessageUpdate` event #2483

Job	Run time
Minimum supported Rust version	1m 4s
Spelling	10s
Format	12s
Minimal crate versions	57s
Build docs	1m 3s
Clippy	1m 0s
Feature combinations	18m 48s
Test	1m 46s
	25m 0s

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