feat: add multi-policy sponsorships

[alex-miao]

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PR-Codex overview

This PR updates the version numbers across multiple files and modifies the policyId parameter to accept both string and string[] types in several locations, enhancing flexibility in handling policy IDs.

Detailed summary

• Updated VERSION from 4.5.1 to 4.6.0 in:
  • aa-sdk/core/src/version.ts
  • account-kit/signer/src/version.ts
  • account-kit/logging/src/version.ts
• Changed policyId type from string to string | string[] in:
  • account-kit/infra/src/client/smartAccountClient.ts
  • account-kit/infra/src/middleware/gasManager.ts
  • account-kit/core/src/types.ts
  • account-kit/infra/src/middleware/gasManager.ts documentation

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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]

almost feels like we need one more permutation here like the following that allows you to specify the policyId array at the top level instead of nesting it

{
  chain: Chain;
  chains: {
    chain: Chain;
    transport?: AlchemyTransport
  }[],
  transport: AlchemyTransport;
  signerConnection?: ConnectionConfig;
  policyId?: string[];
}
| {
  chain: Chain;
  chains: {
    chain: Chain;
    transport?: AlchemyTransport
  }[],
  transport?: never;
  signerConnection: ConnectionConfig;
  policyId?: string[];
}