[Bug] Loading libraries is not optimised

Description

Libraries are loaded in the API Provider in a for loop and then on resolution of each library set into state. This causes lots of re-renders of all children of the API Provider to be updated several times when the components are first loaded.

The way the map instances are created are also fairly unpereformant, the API Contect tracks map instances in state, and the state is set from inside the Map component as it loads forcing multiple renders for that also every time, and it causes the whole tree to re render.

All of these thing also happen in isolation in different hooks used inside the API Context which means in total there is quite a few renders by the time everything is loaded and things stop getting set into state.

There is also hooks that allow a similar flow to the Map state management which allows you to render a new library in a child of the API context which then sets the new library into state in the ApiProvider also causing multiple re renders on loading of new libraries in children.

Would probably be a good idea to rethink the way the way the API Context provider is structured, possible making use of Promises.all() or simliar methods to wait on mutliple asynchronus requests to complete at the same time, Loading libraries directly at the time of creating the Context or storing them / sharing them in a different way because the performance problems means that you can't really wrap that provider around a full page and make use of multiple libraries under one provider.

Steps to Reproduce

Create a blank react app and add the package.
Create a basic page
Render a basic map
Add a console.log('render') to the blank page in a subcomponent wrapped by the context provided.
See lots of renders.

Environment

• Library version:
• Google maps version: weekly
• Browser and Version:
• OS:

Logs

No response

Start by reproducing the issue in a blank React app with a basic map and a console.log in a child wrapped by the API Provider. Read the API Provider, API Context, Map component, and hooks that load libraries or track map instances. Done means the initial map and library loading no longer cause the reported repeated child renders, including when a child requests another library.