looprpc: fix build and permissions of two RPCs

[starius]

Two fixes for looprpc module:

• looprpc depends on our protobuf-go fork. It failed with compilation errors when building the module itself.

• Both SweepHtlc and StaticAddressLoopIn are active, so the "swap" entity must have action=execute, not read.

Pull Request Checklist

• Update release_notes.md if your PR contains major features, breaking changes or bugfixes

[gemini-code-assist]

Summary of Changes

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This pull request addresses build failures in the looprpc module by integrating a specific protobuf-go fork and updates security permissions for critical RPC endpoints to ensure proper execution access.

Highlights

• Dependency Management: Updated the looprpc module to use a custom protobuf-go fork that supports hex formatting for raw bytes, resolving build-time compilation errors.
• Permission Updates: Corrected the permission levels for SweepHtlc and StaticAddressLoopIn RPCs by changing the 'swap' entity action from 'read' to 'execute'.

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[gemini-code-assist]

Code Review

This pull request replaces the standard google.golang.org/protobuf dependency with a forked version that supports formatting raw bytes as hex instead of base64. Additionally, it updates the required permissions for the SweepHtlc and StaticAddressLoopIn RPC methods, changing the swap entity action from read to execute. I have no feedback to provide.

[hieblmi]

I remeber there being backward compat restrictions with these permissions. Are old clients able to change these perms seamlessly?

[starius]

@hieblmi I validated it in regtest. The macaroon created before this fix, works in the updated Loop. I tested both sweephtlc and static loop-in.

[hieblmi]

LGTM