swapserverrpc: add multi-address proofs

[hieblmi]

Carry each deposit client derivation key and an optional generated change descriptor in static-address loop-in and withdrawal requests. The server can use these fields to validate scripts it does not store directly.

[gemini-code-assist]

Summary of Changes

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This pull request updates the RPC definitions to enhance security and flexibility for static-address loop-in and withdrawal operations. By adding client public key mappings and change output metadata, the server gains the ability to verify deposit derivations and handle change outputs more effectively.

Highlights

• Added multi-address proof support: Introduced deposit_to_client_pubkeys maps to ServerPsbtWithdrawRequest and ServerStaticAddressLoopInRequest to allow the server to validate scripts it does not store directly.
• Added change output metadata: Defined a new StaticAddressChangeOutput message and integrated it into withdrawal and loop-in requests to support returning funds to newly generated static addresses.

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[gemini-code-assist]

Code Review

This pull request updates the swapserverrpc protocol definitions to support static address change outputs and client public keys. It introduces a new StaticAddressChangeOutput message and adds deposit_to_client_pubkeys and change_output fields to both ServerPsbtWithdrawRequest and ServerStaticAddressLoopInRequest messages. I have no feedback to provide.

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