Need Autocomplete Preview Feature for Site Search

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### Card
**As a** customer I want an autocomplete / preview of suggested search terms and top products displayed to me as I'm typing in my search query **so that** I can find what I want to buy faster.

### Notes / Details
- Top suggested products should display product name, short description,product picture, product price
- Admin should be able to configure # of suggested search terms (default 3) and suggested products (default 3)
- Should work well for tablets and mobiles
- Autocomplete/Preview results should be cached for performance.
-- To keep effort low, cache can be managed by TTL configuration or manual purge action by admin

Coding Details / Pointers to Interfaces to use
- [Stackexchange Thread Where @paliarush provided insights on interfaces to use for autocomplete/preview](https://magento.stackexchange.com/questions/90209/magento2-advanced-searching-smartsearch/90607#90607)
- Should be easy to extend/customize. Ie CMS search is another feature on our radar
- Rough Mockup of Preview Config:

- Rough Mockup of Autocomplete/Preview:

### Acceptance Criteria (AC)

1. As customer types in search query they see top suggested search terms and top suggested products for the partially matched search query.
2. A customer can select a suggested search terms or top suggested product and execute that search term query or go right to that product page. They can also select all product results link. Alternatively they can hit enter and execute their search query as they have entered it.
4. An administrator can configure how many top suggested products and top suggested search terms to display
5. Developed using public apis; adding appropriate public apis so feature can be easily customized or extended in the future

**Original Report**: https://github.com/magento/magento2/issues/11104 by @choukalos

Start by reviewing the linked Stack Exchange discussion and the public interfaces it identifies for autocomplete and preview. Use the acceptance criteria to define done: configurable term and product counts, selectable suggestions, mobile-friendly results, and cache management through TTL or manual purge.

Written by the indexing model from the issue text.