feat: add permit extensions tip

[howydev]

Adds a tip that proposes a permit overload that supports smart accounts and tempo EOAs (including P256+webauthn keys)

[github-actions]

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tempo: minor
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Added TIP-1021 specification document defining permit extensions for TIP-20 tokens. Introduced a `bytes signature` overload for the `permit()` function that enables permit functionality for smart contract wallets and Tempo EOAs using P256 or WebAuthn keys via EIP-1271 signature validation.

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