chore: remove cargo stylus command as dependency

[nicoan]

Summary

move-stylus CLI used under the hood cargo stylus to deploy and activate. Now the code to peform those two actions is embedded in the CLI. This was necessary since from version 0.6 to 0.10, the API changed.

Also now we do not depend on external tools for deploy and activate.

Changes Made

• Removed cargo stylus command dependency
• Coded deploy and activate subcommands directly in the CLI

Checklist

• I have read the contributing guidelines.
• I have added/updated tests where appropriate.
• I have run relevant tests locally.
• I have updated relevant documentation (if applicable).
• I have disclosed any AI assistance per AI_POLICY.md.