feat: add multi-policy sponsorships

[alex-miao]

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PR-Codex overview

This PR focuses on updating the type of policyId across various files to allow it to accept either a string or an array of string. This change enhances flexibility in handling multiple policy IDs within the Alchemy gas manager.

Detailed summary

• Updated policyId type to string | string[] in createConfig.ts.
• Modified RequestGasAndPaymasterAndDataRequest type in types.ts.
• Changed documentation for policyId in alchemyGasManagerMiddleware.mdx.
• Updated policyId type in smartAccountClient.ts.
• Altered RpcConnectionConfig to accept policyId as string | string[].
• Adjusted parameter type in alchemyGasManagerMiddleware function to string | string[].
• Updated interface AlchemyGasAndPaymasterAndDataMiddlewareParams to reflect new policyId type.

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[moldy530]

can one chain have multiple policy ids?

[alex-miao]

Yes, with the idea being that when we have gas grants you can add both the grant as well as your own policy. In general this model might be worth revisiting now that we also have multi-chain policices.

[moldy530]

yea with multi-chain policies, it almost feels like we can add support for that at the top level and just have a policyId?: string[] and start pushing folks towards that

[moldy530]

@alex-miao is this still relevant?