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, 59 insertions, 0 deletions

diff --git a/ops/op2/test_cases/sync/generics.out b/ops/op2/test_cases/sync/generics.out
new file mode 100644
index 000000000..26e3af9b7
--- /dev/null
+++ b/ops/op2/test_cases/sync/generics.out
@@ -0,0 +1,59 @@
+#[allow(non_camel_case_types)]
+pub struct op_generics<T> {
+    _unconstructable: ::std::marker::PhantomData<(T)>,
+}
+impl<T: Trait> deno_core::_ops::Op for op_generics<T> {
+    const NAME: &'static str = stringify!(op_generics);
+    const DECL: deno_core::_ops::OpDecl = deno_core::_ops::OpDecl {
+        name: stringify!(op_generics),
+        v8_fn_ptr: Self::v8_fn_ptr as _,
+        enabled: true,
+        fast_fn: Some({
+            use deno_core::v8::fast_api::Type;
+            use deno_core::v8::fast_api::CType;
+            deno_core::v8::fast_api::FastFunction::new(
+                &[Type::V8Value],
+                CType::Void,
+                Self::v8_fn_ptr_fast as *const ::std::ffi::c_void,
+            )
+        }),
+        is_async: false,
+        is_unstable: false,
+        is_v8: false,
+        arg_count: 0usize as u8,
+    };
+}
+impl<T: Trait> op_generics<T> {
+    pub const fn name() -> &'static str {
+        stringify!(op_generics)
+    }
+    pub const fn decl() -> deno_core::_ops::OpDecl {
+        deno_core::_ops::OpDecl {
+            name: stringify!(op_generics),
+            v8_fn_ptr: Self::v8_fn_ptr as _,
+            enabled: true,
+            fast_fn: Some({
+                use deno_core::v8::fast_api::Type;
+                use deno_core::v8::fast_api::CType;
+                deno_core::v8::fast_api::FastFunction::new(
+                    &[Type::V8Value],
+                    CType::Void,
+                    Self::v8_fn_ptr_fast as *const ::std::ffi::c_void,
+                )
+            }),
+            is_async: false,
+            is_unstable: false,
+            is_v8: false,
+            arg_count: 0usize as u8,
+        }
+    }
+    fn v8_fn_ptr_fast(_: deno_core::v8::Local<deno_core::v8::Object>) -> () {
+        let result = Self::call();
+        result
+    }
+    extern "C" fn v8_fn_ptr(info: *const deno_core::v8::FunctionCallbackInfo) {
+        let result = Self::call();
+    }
+    #[inline(always)]
+    pub fn call() {}
+}