feat(cmd-socketio-server): move to examples as deprecated

[outSH]

• Move cmd-socketio-server from packages/cactus-cmd-socketio-server to examples/cactus-common-example-server/.
• This package is now meant only as a setup component for some example apps and is not meant to be used in the production code anymore. Package should be removed in the future after sample apps are refactored to work without it.

Pull Request Requirements

• Rebased onto upstream/main branch and squashed into single commit to help maintainers review it more efficient and to avoid spaghetti git commit graphs that obfuscate which commit did exactly what change, when and, why.
• Have git sign off at the end of commit message to avoid being marked red. You can add -s flag when using git commit command. You may refer to this link for more information.
• Follow the Commit Linting specification. You may refer to this link for more information.

Character Limit

• Pull Request Title and Commit Subject must not exceed 72 characters (including spaces and special characters).
• Commit Message per line must not exceed 80 characters (including spaces and special characters).

A Must Read for Beginners
For rebasing and squashing, here's a must read guide for beginners.