DEV-2772: Add direct file transfer support

[piotrbulinski]

This pull request introduces a new feature to the CLI that allows users to copy files and directories directly to and from devices, along with supporting code changes and documentation. It also adds a utility for agent version comparison to ensure compatibility, and updates dependencies. The most important changes are grouped below.

New File Copy Feature

• Added a new copy subcommand to the CLI, enabling users to copy files and directories to and from devices using the syntax qbee-cli copy [<deviceID>:]<sourcePath> [<deviceID>:]<destinationPath>. The command validates arguments and ensures only one endpoint is remote. [1] [2]
• Implemented UploadFileToDevice and DownloadFileFromDevice methods in the client, which handle file transfers and check that the device is running agent version 2026.19 or higher.

Agent Version Compatibility

• Added the IsMinimumAgentVersion method to DeviceInventory, which compares agent versions to ensure the device meets minimum requirements for features like file copy.
• Added comprehensive unit tests for IsMinimumAgentVersion to cover various version comparison scenarios and edge cases.

Documentation

• Updated the README.md with clear instructions and examples for using the new file copy feature, including requirements and usage notes.

Dependency Updates

• Updated dependencies in go.mod to newer versions for smux, transport, term, and sys.

Internal Improvements

• Minor import additions in inventory.go to support new functionality.

[dmitry84]

Do we have any limits on the file size?

[piotrbulinski]

No.