Avoid tweakpane imports in public declarations

[2lll5]

Fixes #13680.

This keeps the devtools runtime dependency on tweakpane, but stops the generated public declarations from importing tweakpane or @tweakpane/core by using local structural types for the devtools APIs that leak into the bundled declarations.

Verification:

• npm run build-dts
• npm run tsc
• npx eslint --cache src/ui/control/devtools.ts
• npm run test-typings

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[github-actions]

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