Connection remove command

[sfc-gh-jsikorski]

Pre-review checklist

• I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• I've added or updated automated unit tests to verify correctness of my new code.
• I've added or updated integration tests to verify correctness of my new code.
• I've confirmed that my changes are working by executing CLI's commands manually on MacOS.
• I've confirmed that my changes are working by executing CLI's commands manually on Windows.
• I've confirmed that my changes are up-to-date with the target branch.
• I've described my changes in the release notes.
• I've described my changes in the section below.

Changes description

As per user request, this PR adds command snow connection remove to remove connection from config file by providing it's name

[sfc-gh-turbaszek]

How do you now where the connection should be removed? How do you determine if it's from config.toml or connections.toml?

[sfc-gh-jsikorski]

Good point :)