Add copy as cURL button to Requestor

[oscarvz]

Adds a 'copy as cURL' button to the bottom bar in Requestor. It's currently behind a feature flag still.

• Add BottomToolbar directory that houses its child components:
  • New: CopyAsCurl
  • Moved: RequestBodyCombobox
• Logic & user feedback when a button is disabled (based on method and/or unsupported types)

[!note] I didn't bother with memoizing any of the logic implemented in CopyAsCurl, as every single interaction will result in a rerender - unless we memoize each prop individually, which introduces quite some overhead with negligible performance gains.

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Can do: https://github.com/user-attachments/assets/c2fe3a08-b39e-4b02-9ee6-b1bb9d9fe4f0

No can do: https://github.com/user-attachments/assets/a19a7b31-7c59-414d-9a8c-02ceade66429

[pkg-pr-new[bot]]

commit: 1be4f79

pnpm add https://pkg.pr.new/fiberplane/fpx/@fiberplane/studio@153

pnpm add https://pkg.pr.new/fiberplane/fpx/@fiberplane/hono-otel@153

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