✨ (signer-btc) [DSDK-482]: Implement sign message

[fAnselmi-Ledger]

📝 Description

This is the agglomerated giga-PR for sign message in BTC signer.

It includes:

• feat/DSDK-462-ts-signer-implement-a-client-commands-handler polished and comments addressed
• feat/DSDK-474-ts-signer-implement-sign-message-task-and-refactor-continue-command polished and comments addressed
• Sign message task
• Sign message plugged in sample app

• JIRA or GitHub link: DSDK-474, DSDK-477, DSDK-462, DSDK-482

✅ Checklist

Pull Requests must pass CI checks and undergo code review. Set the PR as Draft if it is not yet ready for review.

• Covered by automatic tests
• Changeset is provided
• Impact of the changes:
  • list of the changes

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🧐 Checklist for the PR Reviewers

• The code aligns with the requirements described in the linked JIRA or GitHub issue.
• The PR description clearly documents the changes made and explains any technical trade-offs or design decisions.
• There are no undocumented trade-offs, technical debt, or maintainability issues.
• The PR has been tested thoroughly, and any potential edge cases have been considered and handled.
• Any new dependencies have been justified and documented.

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Name	Status	Preview	Comments	Updated (UTC)
device-sdk-ts-sample	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 16, 2024 2:15pm

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Name	Status	Preview	Comments	Updated (UTC)
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[jdabbech-ledger]

LGTM, nice work for the client command handlers 👍
Look forward to rebase on it for the sign psbt task, with a few refactor in order to separate and reuse the client commands loop actually implemented in sign message task

[jiyuzhuang]

Just A reminder: the screen display on device (Flex in your example) is unique now, the second one with the rond button at the bottom left is the chosen one. Maybe this is not related to the tickets in this PR.