feat: Optimism provider

[Wodann]

This PR adds all required trait implementations to be able to use Optimism's chain spec for a provider.

NOTE: To expedite exposing Optimism for testing in Hardhat, I didn't spend time on adding Optimism-specific provider tests yet.

[changeset-bot[bot]]

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Latest commit: 6e7ffc2dbe33970a86554d4ce3797dee8c04b6be

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