How we organized the Rust Clippy feature freeze

During two releases (1.88.0 - 1.90.0) we paused the introduction of new features into the Clippy linter. This means that we held hostage all lint-adding pull requests, all false-negative fixing pull requests, ALL new configuration options for user-facing features and overall, anything that added new complexity instead of taking it away (with the exception of bugfixes that focused on removing false…