feat: view key option

[kbizikav]

Summary

• Add view key option to CLI commands
• Cherry-picked from main-view-key branch

Test plan

• Verify CLI commands work with view key option
• Test existing functionality remains unchanged

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR adds a --view-key option to CLI commands as an alternative to --private-key for read-only operations. Users can now provide either a view key or a private key for commands that don't require spend authority.

Changes:

• Added resolve_view_pair function to handle view key or private key input
• Updated 14 CLI commands to accept optional --view-key parameter with mutual exclusivity constraints
• Modified command handlers to use the new resolution logic

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
cli/src/args.rs	Added optional view_key parameter to 14 commands with required_unless_present constraints for mutual exclusivity with private_key
cli/src/format.rs	Implemented viewkey_to_viewpair and resolve_view_pair functions to convert view keys to ViewPair and handle input resolution
cli/src/main.rs	Updated command handlers to use resolve_view_pair instead of direct privkey_to_keypair calls, and added import for the new function

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