feat: Ledger sign message support

[JordiParraCrespo]

Ledger sign message support

This PR adds support for message signing using Ledger hardware wallet.

Key Changes:

• Added signMessage and signDelegateAction methods to the ledger-client.
• Optimized CHUNK_SIZE to reduce the number of communication calls to the Ledger device.
• Integrated signMessage into the ledger class.
• Added unit tests to cover the new message signing functionality.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Type of change.

• FIX - a PR of this type patches a bug.
• FEATURE - a PR of this type introduces a new feature.
• BUILD - a PR of this type introduces build changes.
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• STYLE - a PR of this type introduces style changes.
• REFACTOR - a PR of this type introduces refactoring.
• PERFORMANCE - a PR of this type introduces performance changes.
• TEST - a PR of this type adds more tests.
• CHORE - a PR introduces other changes than the specified above.