Add pickers for rule creation with control API and CLI examples

[owenpearson]

AIT-375

Adds pickers for channel/integration rule creation examples so that where applicable, users can choose between:

• Using the website dashboard UI (all the existing examples were doing this)
• Using the Control REST API
• Using the Ably CLI

The UI looks like this:

Some possible future enhancements which I haven't implemented here could be to:

• Persist users choice in the browser.
• Add icons for each option.
• Add examples using terraform or other options (e.g. ably-control-go)

[coderabbitai]

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