Create React Best Practices Documentation

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The extension code base has several patterns of component structures in it, some of which are deprecated while others are the current promoted way of writing react components. The purpose of this document is to encapsulate all of our best practices such that a new contributor is not guessing on the appropriate way to build components (as well as how to do the other parts of React, such as contexts, hooks, etc).

This document is product *agnostic* and will need to have members of both @MetaMask/extension-devs and @MetaMask/mobile-devs weigh in on the final document to make sure that it properly reflects shared principles. The document that fulfills this ticket need not be a reflection of the current state of the products, either. If during discussion we agree upon a shared best practice across products but one product team has not yet implemented any instances of that best practice, that is fine. Documentation that is created in this repo is subject to change, approval and ratification of updates.

Inizia esaminando i pattern esistenti per componenti, context e hook React nelle codebase di extension e mobile, annotando gli approcci deprecati e quelli attualmente promossi. Prepara una bozza indipendente dal prodotto per raccogliere input da @MetaMask/extension-devs e @MetaMask/mobile-devs, quindi conferma che le pratiche condivise siano approvate e ratificate.

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