Fix Rust linting issues (#5659)

Rust lint CI step fails on all PRs at the moment. This PR fixes it - I
don't know if it's the optimal way, but it fixes the problem so I
suggest to merge and revisit if needed.

FYI: @rroelke 

---
TYPE: NO_HISTORY

Author: ypatia

.github/workflows/check-lint.yml

@@ -1,5 +1,6 @@
 name: check-lint
 on:
+  workflow_dispatch:
   push:
     branches:
       - main

tiledb/oxidize/cxx-interface/src/sm/array_schema/mod.rs

@@ -1,5 +1,7 @@
 #[cxx::bridge]
 mod ffi {
+    #![allow(unused_attributes)]
+
     #[namespace = "tiledb::sm"]
     extern "C++" {
         type Datatype = crate::sm::enums::Datatype;

tiledb/oxidize/cxx-interface/src/sm/enums/mod.rs

@@ -1,5 +1,7 @@
 #[cxx::bridge]
 mod ffi {
+    #![allow(unused_attributes)]
+
     #[namespace = "tiledb::sm"]
     #[derive(Copy, Debug)]
     enum ArrayType {

tiledb/oxidize/cxx-interface/src/sm/misc/mod.rs

@@ -1,5 +1,7 @@
 #[cxx::bridge]
 mod ffi {
+    #![allow(unused_attributes)]
+
     #[namespace = "tiledb::sm"]
     unsafe extern "C++" {
         include!("tiledb/sm/misc/types.h");

tiledb/oxidize/cxx-interface/src/sm/query/ast/mod.rs

@@ -1,5 +1,7 @@
 #[cxx::bridge]
 mod ffi {
+    #![allow(unused_attributes)]
+
     #[namespace = "tiledb::sm"]
     extern "C++" {
         type ByteVecValue = crate::sm::misc::ByteVecValue;

tiledb/oxidize/cxx-interface/src/sm/query/readers/mod.rs

@@ -1,5 +1,7 @@
 #[cxx::bridge]
 mod ffi {
+    #![allow(unused_attributes)]
+
     #[namespace = "tiledb::sm"]
     extern "C++" {
         type Tile = crate::sm::tile::Tile;

tiledb/oxidize/cxx-interface/src/sm/tile/mod.rs

@@ -1,5 +1,7 @@
 #[cxx::bridge]
 mod ffi {
+    #![allow(unused_attributes)]
+
     #[namespace = "tiledb::sm"]
     unsafe extern "C++" {
         include!("tiledb/sm/tile/tile.h");