wasm: Add WAMR support (#16057)

WebAssembly Micro Runtime (WAMR) is a standalone WebAssembly (WASM) runtime with a small footprint. It includes a few parts as below:

The "iwasm" VM core, supporting WebAssembly interpreter, ahead of time compilation (AoT) and Just-in-Time compilation (JIT)

The application framework and the supporting API's for the WASM applications

The dynamic management of the WASM applications

Risk Level: Medium
Testing: Runtime unit testing, integration testing and manual testing

Signed-off-by: Le Yao <le.yao@intel.com>

Mirrored from https://github.com/envoyproxy/envoy @ a7fa3311ad1f847d80e139970d5325a4efcbdbc1

envoy/extensions/wasm/v3/wasm.proto

@@ -62,6 +62,11 @@ message VmConfig {
   //
   // **envoy.wasm.runtime.v8**: `V8 <https://v8.dev/>`_-based WebAssembly runtime.
   //
+  // .. _extension_envoy.wasm.runtime.wamr:
+  //
+  // **envoy.wasm.runtime.wamr**: `WAMR <https://github.com/bytecodealliance/wasm-micro-runtime/>`_-based WebAssembly runtime.
+  // This runtime is not enabled in the official build.
+  //
   // .. _extension_envoy.wasm.runtime.wavm:
   //
   // **envoy.wasm.runtime.wavm**: `WAVM <https://wavm.github.io/>`_-based WebAssembly runtime.