feat(contracts-periphery): create Faucet contract

[tremarkley]

context & discussion
https://www.notion.so/oplabs/Superchain-faucet-backend-changes-ce42ce8e9f3b4725a41b696a822db4af?pvs=4

This contract will be used for distributing testnet funds from the Superchain faucet

Added Faucet contract
Added tests

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Latest commit: b29868e

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[semgrep-app]

Semgrep found 1 no-fprintf-to-responsewriter finding:

• proxyd/tools/mockserver/handler/handler.go: L76

Detected 'Fprintf' or similar writing to 'http.ResponseWriter'. This bypasses HTML escaping that prevents cross-site scripting vulnerabilities. Instead, use the 'html/template' package to render data to users.

_{Created by no-fprintf-to-responsewriter.}

[smartcontracts]

LGTM. We should put like 1k Goerli ETH into this contract and tell people they can keep the Goerli ETH if they break the contract.

[mergify]

This PR has been added to the merge queue, and will be merged soon.

[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.

[mergify]

This PR is next in line to be merged, and will be merged as soon as checks pass.