feat: Adding label as cli command for cloud deployment

[sean-hickey-wf]

What does this PR address?

This PR adds the ability to add labels to bentoml cloud deployments using the conventional --label key=value syntax.

This has been tested on deployments and the values are now coming through using

bentoml deploy -n my-first-bento --label name=working

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[hyperlint-ai]

PR Change Summary

Added support for labels in cloud deployments via the CLI and updated documentation accordingly.

• Introduced the ability to add labels to cloud deployments using the --label syntax.
• Updated documentation to include instructions for adding labels via the CLI and Python API.
• Enhanced organization and management of deployments with key-value pair labels.

Modified Files

• docs/source/scale-with-bentocloud/deployment/configure-deployments.rst

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