feat(cli): add SDK commands for probe configuration templates

[sempervent]

Summary

Adds an opensampl sdk command group to make creating custom clock probe types easier.

• Adds opensampl sdk template CONFIG_PATH to generate a pre-populated YAML configuration template.
• Adds opensampl sdk create CONFIG_PATH for creating a probe scaffold from that configuration.
• Preserves opensampl create CONFIG_PATH as a compatibility alias.
• Prevents template generation from overwriting existing files.
• Updates documentation and corrects the documented metadata_fields format.

Testing

• Added CLI tests for template generation, configuration validation, overwrite protection, and command compatibility.
• 83 non-integration tests pass.
• Ruff checks pass.

[midgemacf]

Should probably leave this commented out too, so that users don't end up adding these two three random columns