Add missing WASM/WAT files.

[jplevyak]

Add missing WASM/WAT files.

[istio-testing]

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[PiotrSikora]

Aren't we deprecating WAT files?

[jplevyak]

Yes, but I find them useful for debugging. How about we remove the .wat loading test in the V8 PR but leave the files themselves until after the Emscripten and V8 support is done.

[PiotrSikora]

Ah, sorry, I was under the impression that you wanted to remove them. I'm fine either way.

[jplevyak]

Changed my mind while debugging the WASM protobuf support. Thanx