chore: Create FUNDING.json for OP RPF

[p-shahi]

IP Shipyard is applying for Optimism's retroactive public funding round for developer tooling. This PR adds a json file to associate this repo with IP Shipyard's application.

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🎉 This PR is included in version 10.0.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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