e3phoenix: Adding enhance elixir extism example

[Benanna2019]

Example using enhance-ssr/wasm with extism in an Elixir/Phoenix LiveView application.

[github-actions]

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (Benanna2019)[https://github.com/Benanna2019]
❌ @benjamin Patton
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[Benanna2019]

I have read the CLA Document and I hereby sign the CLA

[macdonst]

recheck