Add @run-wasm/clarity package and /clarity page

[mcintyre94]

This PR adds support for the Clarity REPL in a new @run-wasm/clarity package.

It also adds a new example page /clarity demonstrating the new package

Notes:

• The clarity-repl JS package comes with a file clarity_repl_bg.wasm which seems to be used by default in init(). But in Next this isn't working correctly (it can't resolve that URL), so I've copied it into public/ in the example app
• I've added support for initCode which runs before each run(code) call. In the example app it's used to mint STX to the address the code runs as, meaning that STX transfers can work correctly
• State resets when you call clarityClient.initialise(). In the example app I call that before each run but clients can call run(code) multiple times with eg. balances/token state maintained between runs too

Demo: https://run-wasm-git-cm-clarity-sliphq.vercel.app/clarity

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🔍 Inspect: https://vercel.com/sliphq/run-wasm/9o9kZM37V2bhomkibqiYsEwCSHYv
✅ Preview: https://run-wasm-git-cm-clarity-sliphq.vercel.app

[malerba118]

Nice, cool stuff