Refactor/fix clippy errors (#2056) (#2057)
* chore: add clippy config file
* refactor: fix clippy errors and wornings of runtime-async-std-native-tls,sqlx-all
* refactor: fix clippy errors and wornings of sqlx-sqlite, sqlx-mysql, sqlx-postgres
* chore: format
* refactor: fix clippy
* fix: import path
* refactor: fix clippy errors and wornings of sqlx-sqlite, sqlx-mysql, sqlx-postgres
* fix: revert some space and comma removal
* fix: revert some space and comma removal
* refactor: add feature flag
* fix: import path
* test: remove mismatch feature flag
* test: remove mismatch feature flag
* chore: add proper feature flag
* chore: remove feature flag
* refactor: remove clippy.toml file
* fix: re-export driver
* fix: re-export JoinType
* fix: remove feature flag
* chore: add #[allow(unused_imports)] for driver
Co-authored-by: Shogo Nakano <61229807+shogo-nakano-desu@users.noreply.github.com>