Support WASM import in Worker

[3846masa]

”worker-plugin@1.1.1" doesn't bundle wasm file. (The sample code is here.)

I think it cause because FetchCompileWasmTemplatePlugin isn't enabled.
See https://github.com/webpack/webpack/blob/v4.26.1/lib/WebpackOptionsApply.js#L110-L122.

This PR fixed it.

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[3846masa]

I signed it!

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CLAs look good, thanks!

[3846masa]

@developit ping?

[3846masa]

@developit Would you please check this PR?

[developit]

Sorry for they delay! This looks good, and you have tests! 🤩