Implement parameter substitution for migrations #3847
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Does your PR solve an issue?
fixes #3178
Is this a breaking change?
No. The addition of fields to the Migrator is semver exempt, The MigrateError enum is
#[non-exhaustive]
. The new macro functionality retains the existing functionality of the crate and should be backward compatible. I'm making the assumption that changes to the function signatures of sqlx-cli are not considered breaking, but please correct me if I'm wrong there.