Enable clippy lints on a workspace level

This enables a lot more lints than before in some crates, so this fixed a lot of warnings as well.

crates/policy/Cargo.toml

@@ -7,6 +7,9 @@ license.workspace = true
 homepage.workspace = true
 repository.workspace = true
 
+[lints]
+workspace = true
+
 [dependencies]
 anyhow.workspace = true
 opa-wasm = { git = "https://github.com/matrix-org/rust-opa-wasm.git" }

crates/policy/src/lib.rs

@@ -12,11 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#![forbid(unsafe_code)]
-#![deny(clippy::all, clippy::str_to_string, rustdoc::broken_intra_doc_links)]
-#![warn(clippy::pedantic)]
-#![allow(clippy::missing_errors_doc)]
-
 pub mod model;
 
 use mas_data_model::{AuthorizationGrant, Client, User};