Merge bitcoindevkit/bdk#1092: Use `apply_update` instead of `determine_changeset...

Merge bitcoindevkit/bdk#1092: Use `apply_update` instead of `determine_changeset` + `apply_changeset` around the code

c753584379185b0bd19d130ca39e44c8a6a65e65 refactor(chain): use `apply_update` instead of `determine_changeset` + `apply_changeset` (Wei Chen)

Pull request description:

  This PR implements #1081

ACKs for top commit:
  evanlinjin:
    ACK c753584379185b0bd19d130ca39e44c8a6a65e65

Tree-SHA512: cfb66a427dd76b8d11e07be24de9ba06958cda114b8eec260d492d30fba5a1cecbee2bb3e83b8636f9049eb8e920ad13aa76651a97a01290f53b0c7da8849b41