refactor(ops): op2 support for generics (#19636)

Implementation of generics for `#[op2]`, along with some refactoring to
improve the ergonomics of ops with generics parameters:

- The ops have generics on the struct rather than the associated
methods, which allows us to trait-ify ops (impossible when they are on
the methods)
- The decl() method can become a trait-associated const field which
unlocks future optimizations

Callers of ops need to switch from:
`op_net_connect_tcp::call::<TestPermission>(conn_state, ip_addr)` to
`op_net_connect_tcp::<TestPermission>::call(conn_state, ip_addr)`.

1 files changed, 6 insertions, 1 deletions

diff --git a/core/runtime/ops.rs b/core/runtime/ops.rs
index 1c871cda0..9e37977c8 100644
--- a/core/runtime/ops.rs
+++ b/core/runtime/ops.rs
@@ -218,7 +218,8 @@ mod tests {
       op_test_result_void_ok,
       op_test_result_void_err,
       op_test_result_primitive_ok,
-      op_test_result_primitive_err
+      op_test_result_primitive_err,
+      op_test_generics<String>,
     ]
   );
 
@@ -404,4 +405,8 @@ mod tests {
     )?;
     Ok(())
   }
+
+  // We don't actually test this one -- we just want it to compile
+  #[op2(core, fast)]
+  pub fn op_test_generics<T: Clone>() {}
 }