Missing pageKey parameter in portfolio.getTokensByWallet method despite documentation

[yuercl]

Issue Title

Missing pageKey parameter in portfolio.getTokensByWallet method despite documentation

Problem Description

The portfolio.getTokensByWallet method (or related methods) in the Alchemy SDK JavaScript version lacks the pageKey parameter, which contradicts the official documentation.

Documentation vs SDK Inconsistency

Documentation shows:

• Official docs: https://www.alchemy.com/docs/data/portfolio-apis/portfolio-api-endpoints/portfolio-api-endpoints/get-tokens-by-address
• Documentation explicitly states pageKey parameter is for pagination
• Request examples include pageKey field

Current SDK state:

• Cannot pass pageKey parameter when calling portfolio.getTokensByWallet
• Results in inability to implement pagination functionality

Steps to Reproduce

1. Install latest version alchemy-sdk@3.6.5