[material_ui, cupertino_ui] Migrate macros that contain @tool

[dkwingsmt]

See flutter/flutter#189629.

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[gemini-code-assist]

Code Review

This pull request replaces several {@macro ...} documentation directives with explicit doc comments and temporary TODO notes across multiple UI components in the cupertino_ui and material_ui packages. A review comment identifies a copy-paste error in packages/material_ui/lib/src/autocomplete.dart where the documentation for textEditingController incorrectly references [RawAutocomplete.focusNode] instead of [RawAutocomplete.textEditingController].

[Piinks]

LGTM

[auto-submit]

autosubmit label was removed for flutter/packages/12271, because - The status or check suite Dashboard Checks has failed. Please fix the issues identified (or deflake) before re-applying this label.