Add rootless Docker support and update documentation

[sireeshajonnalagadda]

This PR fixes the issue for rootless docker

• Introduced socketPath option for custom Docker socket configuration in README and devcontainer-feature.json.
• Updated install script to accommodate rootless Docker socket paths.
• Added tests for rootless Docker configurations and custom socket paths.
• Created new documentation for rootless Docker setups and scenarios.
  Checklist
  Changes works as expected for both root and rootless docker environments.