DSH plug-in discovery assistant

Key features

• Say "Is there a plug-in that can..." to DSH, and it will find candidates from the dsh-plugin topic in GitHub, explain the differences, and wait for you to choose before installing and verifying.
• Skill will first run its own script to obtain all public, unarchived, and non-fork dsh-plugin repositories.
• It doesn't matter whether the warehouse belongs to an individual or an organization.
• As long as the repository is public and has the dsh-plugin topic, it can still be discovered after the repository is moved.