Add a new default docker socket search path

[achimnol]

What do these changes do?

• Add a new docker socket search path used by the Docker Desktop app in macOS.
• Add support for Docker client contexts (e.g., OrbStack)

Are there changes in behavior for the user?

No impacts to existing users.

Related issue number

This PR resolves #747, #811.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the changes folder

[achimnol]

I'm going to conclude this PR now and let a PyCon US sprint participant to do the work for context-path support.