Send progress output to stderr instead of stdout

[dipu989]

Pull Request Description

Fix for Issue #388: Spinner Output Cleanup

This pull request addresses the issue described in GitHub issue #388, where the spinner output was generating unprintable characters.

Changes Made:

Initialized the spinner with a default stderr writer.
Redirected all spinner output to stderr, ensuring that it does not interfere with standard output.
This adjustment prevents any unprintable characters from appearing in the final output, enhancing the overall user experience when using the CLI.

Before Change -

After Change -

Impact:
This change improves the clarity and usability of the Civo CLI by ensuring that output for this particular command (with -wait flag) is formatted correctly in every case.

[dipu989]

@uzaxirr @fernando-villalba
For now, I have only proposed a solution for the command mentioned in the ticket. If this approach looks good, I can raise similar changes for subsequent commands that support the -wait flag as well.