Support batch permission grants in wallet_connect to create multiple session keys with single passkey auth

[avataraad]

Description

Currently, the grantPermissions capability in wallet_connect accepts a single permission grant object. To create multiple session keys with different permissions, users must call wallet_grantPermissions multiple times after wallet creation, each requiring separate passkey authentication.

Proposed Enhancement

Allow grantPermissions to accept an array of permission grant objects, enabling creation of multiple session keys during the initial wallet creation flow with only one passkey authentication.

Rationale

• Better UX: Users only authenticate once during wallet creation instead of multiple times
• Seamless onboarding: Session keys are created invisibly as part of wallet setup
• Separation of concerns: Create multiple session keys with distinct focused permissions at wallet creation

Current Behavior

await WalletActions.connect(client, {  
  grantPermissions: {  
    expiry: 1234567890,  
    permissions: { calls: [{ signature: 'mint()' }] }  
  }  
})  
// Creates 2 keys: primary + 1 session key

Desired Behavior

await WalletActions.connect(client, {  
  grantPermissions: [  
    {  
      expiry: 1234567890,  
      permissions: { calls: [{ signature: 'mint()' }] }  
    },  
    {  
      expiry: 1234567890,  
      permissions: { calls: [{ signature: 'transfer(address,uint256)' }] }  
    }  
  ]  
})  
// Creates 3 keys: primary + 2 session keys with different permission