chain-0.23.0

Release chain-0.23.0

Changed

- feat!(chain): implement `first_seen` tracking #1950
- fix(chain): persist `first_seen` #1966
- Persist spks derived from KeychainTxOutIndex #1963
- fix(docs): `merge_chains` outdated documentation #1806
- chore: create and apply rustfmt.toml #1946
- chore: Update rust-version to 1.86.0 #1955
- bump bdk_core to 0.6.0
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