fix: unify maxTokenAmount as token value

[andysim3d]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
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PR-Codex overview

This PR focuses on updating the data types related to maxTokenAmount from BigInt to number across various files, enhancing consistency and usability. It also modifies descriptions in documentation to clarify the purpose of certain fields.

Detailed summary

• Changed maxTokenAmount type from BigInt to number in multiple files.
• Updated description of maxTokenAmount in components.yaml to specify it refers to tokens.
• Adjusted the USDC_GAS_APPROVAL_AMOUNT constant from BigInt to number.
• Refactored PolicyToken interface to use number for maxTokenAmount.
• Modified usages of maxTokenAmount in functions to reflect the new type.

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