Search: Ability to pass a custom SearchCategory renderer to the Search component

[PrincessMadMath]

Feature Request

Problem description

Currently the Search component supports custom renderer for the category name and result items but not for the category layout.

For example, instead of having a two columns layout (with category on the left and results on the right), I would like to be able have a simple list with a header by category:

Proposed solution

Search can receive a new prop "categoryLayoutRenderer", which is passed down to SearchCategory. The default value of this props is the current category layout.

The prop categoryLayoutRenderer, is a function that receive the rendered category name and rendered results items.

Exemple:

MVP

We opened a PR to show the POC of how it can be done: #3672

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[PrincessMadMath]

Updated the description with a PR for the MVP: #3672

[levithomason]

Fixed in #3672