feat(ops): fast calls for Wasm (#16776)

This PR introduces Wasm ops. These calls are optimized for entry from
Wasm land.

The `#[op(wasm)]` attribute is opt-in. 

Last parameter `Option<&mut [u8]>` is the memory slice of the Wasm
module *when entered from a Fast API call*. Otherwise, the user is
expected to implement logic to obtain the memory if `None`

```rust
#[op(wasm)]
pub fn op_args_get(
  offset: i32,
  buffer_offset: i32,
  memory: Option<&mut [u8]>,
) {
  // ...
}
```

1 files changed, 7 insertions, 0 deletions

diff --git a/core/examples/wasm.ts b/core/examples/wasm.ts
new file mode 100644
index 000000000..cdb9cf78c
--- /dev/null
+++ b/core/examples/wasm.ts
@@ -0,0 +1,7 @@
+// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
+
+export declare function op_wasm(): void;
+
+export function call(): void {
+  op_wasm();
+}