Fix <ApolloProvider/> typings

[Madumo]

This fixes the typings of ApolloProvider.

Rather than using the Cache type, which is defined in the TypeScript lib.dom.d.ts declaration file, for the generic parameter to ProviderProps in the ApolloProvider class, it may be more appropriate to use any to let the type flow through when the client is created. It may also be less confusing if the generic type parameter was renamed to something like TCache in the ProviderProps interface definition so it's not confused with the Cache type.

I tested this change in the ApolloProvider.d.ts file and noticed the error went away and the client was properly typed as NormalizedCache when defining the cache as InMemoryCache.

Ref: #1299

[apollo-cla]

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[apollo-cla]

	Warnings
⚠️	There are library changes, but not tests. That's OK as long as you're refactoring existing code

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