Revising multiparty PR

[meling]

Mostly edits on top of multiparty-update branch.

• refactor: update signature handling to use getter methods
• refactor: update message metadata handling to use getter methods
• refactor: update metadata handling to use getter methods in channel
• fix: add back broadcastcall and client interface
• refactor: regenerate from proto and use generated NewServer
• refactor: remove unused SignAndVerify method from EllipticCurve
• refactor: remove commented gob-based encoder in EncodeMsg
• refactor: remove unnecessary error from encodeMsg function
• refactor: replace method with EncodeMsg function and remove error
• refactor: replace encodeMsg with Encode method on gorums.Message type

[deepsource-io[bot]]

Here's the code health analysis summary for commits a723c51..bdb4989. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Go	❌ Failure	❗ 87 occurences introduced	View Check ↗
Shell	✅ Success		View Check ↗

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