Add `wait_for_workers` flag in Dask Distributed config and executor (#131)

[gpauloski]

Description

Add wait_for_workers flag in Dask Distributed config and executor. This is helpful when the client is connected to a remote scheduler and you want to wait to submit work until the workers are connected to the scheduler.

Fixes

• Fixes #131

Type of Change

• [ ] Bug (non-breaking change which fixes an issue)
• [x] Enhancement (non-breaking change which adds or improves functionality)
• [ ] Internal (refactoring, performance, and testing)
• [ ] Breaking (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation (no changes to the code)
• [ ] Development (CI workflows, packages, templates, etc.)
• [ ] Package (package dependencies and versions)

Testing

Added tests for coverage and tested with the cholesky app.

Pull Request Checklist

Please confirm the PR meets the following requirements.

• [x] Relevant tags are added (breaking, bug, documentation, enhancement, package, etc.).
• [x] Code changes pass pre-commit (e.g., ruff, mypy, etc.).
• [x] Tests have been added to show the fix is effective or that the new feature works.
• [x] New and existing unit tests pass locally with the changes.
• [x] Docs have been updated and reviewed if relevant.