feat: Add -v/--version flags to check the current installed version

[Draculabo]

Description

It would be highly beneficial to add a -v or --version flag to the CLI.

Motivation / Use Case

When running or troubleshooting scripts that depend on this library, I often need to verify whether the locally installed npm package is running the latest version or if it's outdated.

Currently, there is no quick way to check the currently running version directly via the CLI, making it harder to debug version-specific issues or confirm if an upgrade (via npm install) was successful.

Having a -v or --version flag will allow users to quickly output the current version string and compare it with the repository's latest release.

Proposed Behavior

Running the CLI with -v or --version should print the current installed version:

devspace -v
# or
devspace --version

[tao-xiaoxin]

Hi bro, I already implemented this.

You can check PR #22

Once you pull the latest changes, you should be able to run:

devspace -v
# or
devspace --version

If you're installing from the project source, the simplest way is:

npm run build
npm install -g . --force

Then just verify it with:

devspace --version

[Waishnav]

-v and --version will be live in next released version