feat(tempo): add remote fee payer transport

[brendanjryan]

Motivation

Remote fee-payer services may fill sponsored transactions without providing relay signing or broadcast methods. The existing remote wrapper requires relay capabilities despite its fee-payer naming.

Summary

• Added withRemoteFeePayer for fill-only remote sponsorship.
• Exported and documented the transport and migration path.
• Added routing coverage for sponsored and unsponsored fills.

Key design considerations

• Routes only eth_fillTransaction requests with feePayer: true to the remote service.
• Keeps every other RPC method, including raw transaction broadcast, on the default transport.
• Leaves withRelay behavior and the deprecated withFeePayer alias unchanged.

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🦋 Changeset detected

Latest commit: 036452b

The changes in this PR will be included in the next version bump.

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viem	Patch

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update the Tempo entrypoint export snapshot

Adding this named export changes Object.keys(tempo), but the inline snapshot in src/tempo/index.test.ts still ends with withRelay and therefore fails on every test run. Add withRemoteFeePayer to that snapshot so the entrypoint test reflects the new public API.

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commit: 036452b