Fix/library loader

[DonovanDeSmedt]

Possible fix for issue 673:

Supports both the previous and current way of loading libraries:

Previous way:

<GoogleMapReact
          bootstrapURLKeys={{
            libraries: 'drawing',
            key: googleMapKey,
          }}
          yesIWantToUseGoogleMapApiInternals
          onGoogleApiLoaded={({ maps }) => {
            console.log(maps.drawing);
          }}
        />

Current way:

<GoogleMapReact
          bootstrapURLKeys={{
            key: googleMapKey,
          }}
          drawingLibrary
          yesIWantToUseGoogleMapApiInternals
          onGoogleApiLoaded={({ maps }) => {
            console.log(maps.drawing);
          }}
        />

[itsmichaeldiego]

@DonovanDeSmedt Great work, thank you so much!

I would keep only the old way, both ways make it more confusing and will lead into conflicts.

Also keep in mind I had to revert your previous PR because builds were failing for some people

[DonovanDeSmedt]

Ok, I'll remove this one and create a new one for some of the changes of the previous PR.

[itsmichaeldiego]

Awesome @DonovanDeSmedt thank you so much!

[lock]

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